All I want to do is catalog and edit my photos but all I have is an Ipad pro. What apps do I need and do I need to subscribe to the creative cloud?
You can have Lightroom mobile as a standalone App on your iPad pro but remember your collections will not be synced.Refer Adobe Photoshop Lightroom for iPad - Capture, Edit, Organize & Share Pictures on the App Store
If want to take Full advantage of this Product you could subscribe to Adobe CC Photography plan where you will get many other Mobile and Desktop Products.Please refer Lightroom and Photoshop | Adobe Creative Cloud Photography plan
Without a desktop or laptop, the Photography Plan would be a complete waste of money IMHO. You couldn't use Lr or Ps. Stick with Adobe's excellent mobile apps instead, and with other excellent iOS apps for photo editing.
Photo organization on iOS is a challenge, since it's so Apple specific. Everything goes into the camera roll, and that's where to start. Lr Mobile can add from there, and then you can organize with Lr Mobile. There aren't tons of alternatives for organization as opposed to editing. Macworld just recently had an article about the limitations of the iPad Pro for photograhers, you might wanna read that: How the iPad Pro stacks up as a photographer’s tool | Macworld