Welcome aboard!
I've got a ton of thoughts for you, as someone relatively new to armor (built a handful as a kid...currently on armor #4 since coming back to the hobby). But the coffee is still kicking in, so please excuse any terseness!
First - good choice of kit. Most Tamiya armor is about as slam-together as you can get. I started back into armor with Tamiya's M4 Early Production and built the thing in a single night.
Second - I'd rethink the winter scheme - for now. Whitewash can be tricky, and there are all kinds of different methods. But for a first build, good old Russian armor green is pretty hard to beat for simplicity.
Third - Tamiya paints (assuming you've got the acrylics) suck for brush painting. It CAN be done, but I can barely do it and I'd hate to inflict it on somebody just starting out. I'm going to assume you don't have an airbrush, so that leaves two choices - brush painting or spraypainting. Both will work. Not sure who makes a Russian armor green-ish color in spray form. For brush paint, Vallejo is my definite favorite.
Fourth - Everyone does the build/paint thing differently. I like to build as much of the vehicle as I can and paint that. Leaving things like the tracks, wheels, wood pioneer tools, etc, off until later. For a beginner, I'd suggest prime it, then put color on it, but as you progress you can do darker base coats, shading, and other fun things.
Here's about how far I go before priming, if you want some visual examples!
For weathering, oh man. Where to even begin? There's drybrushing. Pastels and pigments. Oils. Dot filtering. Streaks and stains. Filter washes. Pin washes. The hairspray technique. Mud. Snow. Rain. T-34s saw EVERYTHING, so I think your best bet is figuring out what you'd like to do, how weathered you want to make it, then draw suggestions on how to do that.
Best of luck - it's a very rewarding hobby to have, and a new face in the forums is always welcome!
P.S. - As one who just returned to modeling last year, I can say that nothing, NOTHING, has done more to elevate my game than hanging out here and seeing/reading what others are doing.