I agree with Laurin - depends on your portfolio. I seem to have the contrarian portfolio. Everyone else's sales slow down and mine pick up. Everyone else's pick up and mine slow down. I've been in a 5 month slump this year and they are finally starting to pick up again. This is about the time of year when everyone else's sales start to slow down for the summer.

I do very well the month of December. It's usually my best month ever. I don't have any Christmas images.

My snowmobile and snow images tend to sell better in the spring and summer and my summer images tend to sell the best in the fall.

About the best plan you can put together is to keep uploading on a regular basis - even when you're working with a site that isn't selling. Spread the expense around multiple sites.

Good luck! Very smart idea to start planning this early.