my older model iPad is locked. It says I can reopen it if I connect it to my computer, then what?

Follow the directions in this link --> If you forgot your iPad passcode - Apple Support

While the message on the screen in the article would be fitting for a more modern iPad, the directions are what you need to follow for your device. It will fully erased in the process. If you have been backing it up, you can restore it from backup after you are back in. If you haven't backed it up, your data will be lost.