It is great to start off with just one Blast per day. Let this become your routine and see how you feel. I personally like to have my Blasts in the morning, it is easier for me to make them then. The best advice I can give you on your diet and what foods to eat is to eat clean.
Try to avoid processed, prepackaged and fried foods. Anything that you can make for yourself is better, that way you know exactly what went into it. If the foods you are eating has ingredients that you can not pronounce, don't eat it. Include fresh produce, meats, nuts seeds and superfoods for a healthy diet.