I'd say choose a nice, subtle cologne. You don't want anything too strong because I find that any overpowering smells ruin the product. I used cool water when I was a teen and no one thought anything aside from the fact that I smelled good.
I use Ralph Lauren 4 right now. For shampoo, I've found anything that isn't specifically flower scented is used by guys. I had a dry scalp for years so I used head and shoulders. Turns out most of my guy friends at uni used the same thing. Body wash was old spice or dove. I like citrus smells. If you use aftershave, brut or old spice are nice. Check out what's popular for guys your age.
It also depends on where you are for what is normal. I'm in Japan and I shop in the men's section (can't pass as female to save my life here) and everything I have gotten is either mint scented or my most recent purchase which was "Man's Cherry Blossom". Most things here are like that. For deodorant I use speed stick. It's subtle and I like it. Under my binder I use baby powder. I always smell pretty nice, according to my students and my coworkers.
Even when I was just starting transition no one walked up to me, sniffed and said I was wearing men's/women's products, so it's really all about what you find pleasing.