oh man if you practice on carpet, try soft ground shoes without the studs in them. you slip a little on the carpet, but they don't ruin the carpet at all.
It's all up to you, the more you practice the better you're going to get. The first tricks I would recommend you try would be like atw, crossover, and reverse crossover. As far as juggling, if you screw up, just try again.
just try to remember that you need practice and practice is the only thing that's going to make you better. and practice heel juggling, i wish i would have done that when i was younger so that i could be good at it now. with freestyle i get lost in the thought that tricks are too hard to do and i'll...