Welcome aboard!
I'd buy as many car parts stickers as possible (K&N, JEGS, etc.), and paste them all over your back window. Each adds approximately 5 HP.
Seriously though, do some searching here. This forum will make you empty your wallet if you're not careful.
First thing I did was purchase an oil catch can, same thing I've done for my past three Hemi vehicles. I'd recommend looking at all the opinions on it and decide for yourself if you'd like to do it or not.
Second thing was quality all terrain tires for the snow. (I only run one set of tires year-around, I don't want to spare the room in the garage for two extra sets of rims/tires.)