Help/ Guide on creating my 1st App

Hi. Welcome to Android Forums.
One of the first things you need to do is design the UI. Your attached screenshot shows a spreadsheet, but is that how you want it to look in the app? Start by sketching out the layouts. Also think about the workflows between screens - how does the user navigate in the app?
You can do all this before you actually get to the real technical stuff, which brings me on to the question of your current level of knowledge. Are you familiar with Java? If not, then your first task is to learn about that.
Have a read of this for some useful information for beginners:

https://androidforums.com/threads/please-read-me-before-posting.987318/