I’m a fan of the chickpea....they also make pasta that’s high protein now, some from chickpeas and other sources. A single source of veg protein is rarely complete so you need like rice to go with beans although it doesn’t have to be in the same meal. Typically if you’re eating actual vegetables, beans and grains it’s not much of an issue. Like chickpea you can do hummus on a sandwich or salads but seriously I can eat a whole can doused in bbq and ranch.... now I’ve never stayed veg for years so it could be there are more complexities, I’m more flexitarian. But these are just a few tips to get you started.