Sign up there and start tracking all of your food. You don't need to change anything yet, just start logging what you eat to get a baseline. It wouldn't hurt to record your weight upon waking each morning also. After doing that for about two weeks, you'll have enough information to start form a diet plan.
Don't be self conscious (easy right?
). Honestly, no one gives a shit what you're doing, and if they do then they have their priorities all fucked up anyways. Take videos to check your form and ask questions here.
Hopefully don't get beheaded for posting that here, but it's really not a bad resource either.
Find a program you like and be consistent. I'm currently doing a 5x5 routine and seeing progress. It's a good routine for beginners.
(you don't have to read the sale pitch, just scroll way down to the table)