I'm a 4 month flexitarian. I eat one meal a week with meal and it's really helped me drop some pounds after gaining 50 after an ankle injury last year that had me sitting down for 2 months while keeping the same eating habits.
Some of my favorite main dishes/snacks are:
bell pepper stuffed with rice(always), mushrooms, squash, whatever I feel like that day, seasoned sort of Mexican-like
big portobello caps topped with greens, maybe some mozzarella
big fan of fresh guacamole: avocado, tomatoes, garlic, lime juice, salt
really like legumes, tree nuts, raisins, dried cranberries
Ease into it, brother. The gastric backlash can be mighty, especially if you were on a high fat high meat diet. :(
I started full throttle and had to back track and start with one veggie meal a day.