I'm definitely up for this but it is way too early to start picking teams. I've been doing this for a few years now and I'd recommend you only do it if you're sure you have true grit. It's a long season and kind of annoying when people drop off from playing.
True! The transfers and friendly matches leading up to the first matches should also be given consideration before finalising a team.
I had a mate tell me that you can transfer all you like before the season starts but I've never noticed that. So I guess you can pick teams now, if you don't like em after the friendlies, transfer them.