Hopefully your Dr. or a post-bariatric RD went over some basics for diet. Here's a good general info link: http://www.ucsfhealth.org/education/dietary_guidelines_after_gastric_bypass/
Regarding your Q about protein:
High-protein foods you can add to a Blast include organic soy milk and tofu, nuts, seeds, nutbutters, hemp seeds, cottage cheese, yogurt, and protein powders. Aim for around 65 to 75 grams of protein a day.