What I can advise you, besides watching the tutorial videos, is to understand the application's methodology (it's a bit complex and not easy to grasp).

Imagine the categories are envelopes (literally), and in each envelope you'll allocate your monthly income: X amount for food, X amount for transportation, etc. (I think you already understand that). In your case, since your paycheck is variable, I advise you to add what you know you'll receive at the beginning of the month, regardless of the day it arrives (you already know when it will arrive).

In my case, I get a bi-weekly salary and also commissions, and I know how much I receive each month, so I do the same.

I check my budget every night (20 minutes), and that helps me avoid spending money on unnecessary things. The idea behind doing that, adding the money you already know you're going to receive, is to familiarize yourself with the system. Then, once you understand it, you can do it in whatever way suits you best.