Someone HELP ME! i just started painting, and...

First of all: I was dumb and painted a little toy indoors. Is i know this is harmful, but i was too lazy to go to the garage. I spend no more than about 20 minutes... thats not that bad right? BTW i used this paint: http://www.kustomkolorpaints.com/kustom ... eounce.jsp
I have a question about my paint brushes. How do i properly clean them? It seems like the panit dries onto the brush, and makes it all sticky and impossible to clean. So far im leaving it in a cup of water, but i feel like if i take it out for more than a minute, the paint will solodify on the brush. What do i do?
And also, im having this problem...
When i paint over the plastic, it really does not go well on it. The paint is really watery and liquidy, and it just smears away. I feel like im water-painting my toys. Any tips?
I have a question about my paint brushes. How do i properly clean them? It seems like the panit dries onto the brush, and makes it all sticky and impossible to clean. So far im leaving it in a cup of water, but i feel like if i take it out for more than a minute, the paint will solodify on the brush. What do i do?
And also, im having this problem...
When i paint over the plastic, it really does not go well on it. The paint is really watery and liquidy, and it just smears away. I feel like im water-painting my toys. Any tips?