How do I use iPhone apps on my macbook? Do they need to be downloaded again seperately?

Hi...

Congrats on the new Mac !!

Use iTunes to re download previously purchased apps.

Downloading past purchases from the App Store, iBookstore, and iTunes Store

For syncing your iOS devices (iPad and iPhone), follow the instructions here > iOS: Syncing with iTunes

These video and text tutorials might come in handy for you > Apple - Find Out How - Mac Basics

How to use the Apple Support Commmunity forums > Apple Support Communities - Tutorials

After you familiarize yourself with how to sync your iTunes content with your devices, you may want to consider using iCloud for back up and storage. But take some time to get to know your Mac first. iCloud - Learn how to set up iCloud on all your devices

🙂

I find your question a bit confusing. Are you wanting to actually use apps for iOS devices on your Mac? If so, you cannot use iOS apps on a Mac. iOS apps are written only for iOS devices. You would need the same app, written for Mac OS X, if you want to use it on your Mac.

If I am misunderstanding your question, please disregard.

🙂