Celtx is a free script/storyboard making software, has its own forum for screen writers, tons of support and you can collaborate with other ppl.

Buy a PC, you can get an 8GB memory desktop in less than $1,000. (To get the best, you have to invest. That rhymes huh?)

Render separately the figures from the background and props to prevent the slowdown. You can replace props with simple primitives while you are animating.

Animating is easy. The only problem is that voice in your head.

Passion is anger and love combined. So if it looks angry, give it some love!