You tube has a ton of video's on pouring plastic but the best advice I think is to start slow. I use a microwave and pyrex cups.
1. shake the heck out of your plastic until its good and mixed 2. I pour a half cup of plastic at a time, that way the color and plastic stays fresh. 3 I microwave 1 minute at a time and stir with a butter knife, once the plastic gets like hot Maple syrup not peacan lol its ready (you will get the feel for it) I dont go by temp beacause each mold of mine shoots a little diff. 4 When you add you color you can always add more, so just go a drop at a time. I shoot my mold with the test color to make sure thats what I want. 5. after that your good to go. I always write my colors recipes down and put a sample of that color in a bag for future reference.
if you need any help just shoot me a pm, good luck and have fun.......OH WEAR GLOVES!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!