On February 14th, he'll be expecting a bit of fuss and attention, the more romantic the better. You will gain serious brownie points for exceeding those expectations. Or perhaps he doesn't yet know how you feel about him. This is the best day to tell him.
Number one on your list is grabbing a Valentine Card. You don't have to 'make do' with a mainstream one, designed for a lady to give her man. Gay Valentine's Day cards are out there in abundance.
To help you choose, I've collected together a few which I've discovered on my travels through cyberspace. Hopefully there's the perfect love card here for you.