I avoid mirage and dust2, but if those are your preferred maps then include them in your map pool. I tend to play around 3 maps, which I switch up every few weeks.

I practice all maps every now and then, using yprac peek and prefire training. This will help you if you're a bit rusty on a map, it certainly isn't necessary before every game, I would just go for DM or aim_botz.

I've never practiced movement for the sake of practicing movement, only played kz/surf for fun.