For bulk, it's just a matter of working the muscle (8-12 reps per exercise, going to failure on most sets) and calories.
The concept of "complete proteins" is based on studies that tests what proteins could be the sole source of protein in the diet and allow one to thrive. Unfortunately, the first studies were done on rats, who need much more of one or two amino acids than humans do. When this was compensated for, plant proteins such as soy, hemp, quinoa and buckwheat come out as being complete proteins.
If you eat proteins that are not 'complete," don't worry about it, as the excess amino acids are stored in the liver for a time, waiting to be used (out bodies don't actually use proteins, but the amino acids that the proteins are built from. The body breaks down preformed proteins (like muscle/meat) into their individual amino acids, then uses these AA's to build whatever proteins it needs).
Grains are usually deficient in certain amino acids, as are beans, but together, they are not. If you eat beans and rice within the same 24-hour-or-so period, the body will mix and match the amino acids to form complete proteins).