I wish you the best, and remember, you can have bad days, bad weeks, even bad months when it comes to fitness. It's all about hard work over a long period of time.

This channel is very good for understanding how to preform exercises correctly, and how certain muscles work https://www.youtube.com/user/JamesGrage

This channel is good to help cut through a lot of the bullshit on the internet. If you are a beginner, FOLLOW HIS PROGRAM, do not question whether or not it is right for you. His beginner program DOES work, it's usually posted in the description of his videos https://www.youtube.com/user/TheAlphaDestiny

As for nutrition, you don't need a bunch of supplements especially when you're first starting out. The best ones you COULD take (don't need to by any means) would be creatine, and bcaa's. Find out how many calories you need to eat to gain muscle (there are many calorie calculators online)

Buy your food in bulk (places like Costco or sams club) and cook a whole bunch of meals all at once