What Information do I need to set up a VPN?

RemoteID and LocalID are VPN parameters that are assigned by the VPN provider uniquely to the end-user, or generically for a specific VPN server. Your provider will be your only source of these parameters.

Here is ExpressVPNs help page for setting-up your VPN connection - using their dedicated App (available from the App Store):

https://www.expressvpn.com/support/vpn-setup/app-for-ios/

If you do try to configure your VPN manually, you would be well advised to use IKEv2 (first choice) or IPsec (second choice) as the VPN Protocol; other VPN protocols, such as Layer 2 Tunnelling Protocol (L2TP) are significantly less secure/robust. An alternative might be to use OpenVPN - but this is considerably more complex to set-up and is not natively supported by iOS.

The easiest way to set up a VPN client on your iPhone or iPad is through an app like ExpressVPN, Tunnelbear, or Opera VPN. Download one of those great apps, install it on your iOS device, and open it. Download only from App Store

After signing up or signing into your account, you'll be prompted to give permission to add a VPN configuration to your iPhone. Tap Allow to have the VPN configured on your iPhone automatically.

You'll then be prompted to enter your passcode or Touch ID to give permission to change your VPN settings. Enter your passcode, or activate Touch ID.

Once the VPN is enabled, you can select and connect it at any time without having to open the app again (use the app to change location and adjust other settings).

1. Launch Settings from your Home screen.
2. Tap General.
3. Tap VPN.
4. 
5. If you have more than one, select the VPN client you want to use.
6. Toggle the Status switch on.
7. 

When you're done using the VPN, follow the instructions above to turn it off. Don't forget to turn it off, especially if you're on a free, limited plan.

I presume that you are attempting to access a VPN connection via third-party VPN Service Provider - as opposed to attempting setup-up of your own VPN Server.

When you sign-up and create an account with a VPN Service provider (using a “paid” or “free” account), the Service Provider should provide details of the VPN Protocol, Server and Authentication configuration. Many providers have a dedicated App that simplify and automate the VPN connection configuration.

You should consider when using a VPN, as a confidentiality or privacy tool, that “free” services have to fund their overhead costs. To do so they will either “mine” your data and/or “serve” advertising to your session. By contrast, a provider to whom you pay a subscription will cover the cost from received revenue - and will (for reputable providers) have no interest in your data.

When choosing a third-party or commercial VPN provider, choose wisely!

I hope this is helpful in providing some additional insight.

It may well be that simple - but only if the router at your hall has a VPN server capability that can be configured to support an inbound VPN connection.

Consider that any inbound connection exposes your hall and its systems to potential attack; any “open” ports can (and will) be discovered by those with malicous intent - so protecting this will be important to you if you already have, or intend to establish, remote access.

Lets start with the type/model of the router that you have at your hall. From this we can determine its potential capabilities - and now having established what you’re trying to achieve, we can provide some more useful advice on the basis of what you have.

It’s a little late for me to prepare a full response tonight, however, given your described application, using a VPN via a commercial VPN operator is going to do little to effectively secure the systems that you are trying to control remotely.

As described, you”ll have a very secure connection between your iPad and the point that your VPN connection terminates (i.e., the VPN server); your connection from there to your meeting hall - and importantly, the public IP address of the system you are controlling - has little protection.

What you should be concentrating on is how to secure the remote systems. You’re already on one potentialy right track, but this particular track would require that you set-up a VPN server at the point of ingress to your hall’s remote systems. It’s all possible, but you’ll need a little more knowledge to configure this kind of system. For example, assuming the hall has a broadband connection utilising a broadband router that has a VPN Server capability (for example, a Draytek Vigor 2860 - other suitable routers are available), then you could build a VPN-protected solution.

Using a commercial VPN, such as ExpressVPN, is very good at protecting your local traffic from interception over something like a public WiFi hotspot - or for your traffic to “appear” as if it is originating from somewhere else so as to bypass geo-restrictions that might prevent streaming services from operating. If your intent is to protect the entire path between your iPad and a remote system, using VPN, then a commercial service such as ExpressVPN (or others) will not achieve the securty aspects/solution that you appear to seek.

You might even consider building a VPN Server on something like a Raspberry Pi computer (something I feel sure you may have heard of), at relatively low cost, but this will require a little more lnowledge and expertise than I fear you may currently have available to you.