To begin? Microwave of 800 to 1000 watts. Invest in and learn to use stabilizer and do not "guess" at what the temperature is, get the thermometer advertised in the plastic accessories are in the Do-It catalog/store. Secondly, don't jump right into large batches. Keep your batching in the 4 ounce range until you are VERY familiar with how the plastic cooks and shoots. Small batching is easier to learn how colorants and hi lite/ pearl works with the plastic too. Buy a spiral notebook and keep it right on your work area so you can make and take notes on every aspect of every batch and you'll soon look at that notebook like its made of gold.
Take your time, stay focused in a work area that is quiet and not going to have distractions. Baby steps. Many, many baby steps.