Hi, Krysi! I think your Mon, Fri/Wed, Sun split sounds great! You might want to add in some exercises for your back and shoulders on upper body days -- you'll find some great ones at ExRx. (Or I can help, or the LWL folks can help.)
I apologize; I wasn't at all clear about WHEN you were to consume the protein and simple carbs

Those should be consumed within an hour AFTER you do weights, so your muscles have the fuel required to rebuild. When you lift, you're tearing the muscle fibers, and the growth and progress comes from the rebuilding -- which, coincidentally, is what causes the soreness, so when lifters say "no pain, no gain" they really are telling the truth!
On a separate note, I hope that you're working towards lifting as heavily as possible. That's where the real progress comes from -- not lifting 2 pound weights! You have to start small though, and work your way up, so don't push yourself too soon. Just know that you should be able to increase the poundage pretty regularly, depending on how often you're lifting and how effectively you're working that body part. There are some different approaches, but it's generally accepted that the appropriate weight is that which you can *just* lift 12 times. Then when you can do that without difficulty, it's time to switch up! (And celebrate!)
The weight "gain" is usually just water retention within the muscles -- which dissipates over time. It's important for folks (not saying you!

) to be mindful of overeating when they're lifting, because it can make you hungrier.
Good luck, and have fun!
