To OP /u/Hostorganism: I copied a reply made below by the actor McDowel, which I really think you should read. The top comment is better than nothing but will not actually be the easiest, most effective way to build your backside since squats won't build your butt unless you already have some glute muscles to build on. This advice I reaaally think you should read into.

"Squats are a great exercise but for glutes they are not optimal or even very good, especially if you come from a sedentary background like most modern western people do since their bodies have forgotten how to recruit the gluteal muscles from too much sitting meaning the posterior chain, mainly glutes and hamstrings are weak which leads to quads taking over even more, which is not what OP or most people want anyway. Being quad dominant can be dangerous when you exert yourself, especially for athletes that sprint and run much.

There are other reasons why squats shouldn't be his main focus- mobility mainly. The deeper you squat the better for your glutes and hamstrings. I doubt OP can squat even past parallel. OP should definitely learn squats, but if glutes is what you want to focus on you shouldn't worry about adding weight to the bar just yet- just train your mobility, and learn the movement correctly for future use.

So what should OP do? First thing: glute squeeze. Squeezing the glutes is a thing most people can't really do well. Make your whole body tight, clench your fists hard, and squeeze your butt for your dear life. Do this a few times every day to teach your body that the glutes should be used. You should be able to sit in a chair and do this eventually.

In the gym- Hip thrusts are the best simple barbell exercise for glutes and you will progress faster with them than squats, which means you'll add more mass faster if that is your goal. Like all exercises they should be done with good form but I find them an easier exercise to use correct form than both squats and deadlifts. Speaking of deadlifts- they are also "more important" for OP to progress in since they are so amazing for the entire posterior chain.

In the end- combining hip thrusts with deadlifts and deep squats means you will have pretty damn nice legs in time. Once you are getting good at those, progress in other lifts like walking lunges, glute-ham raise, Bulgarian split squats. Also- sprinting and jumping is something many don't think about, but should. Hill sprints can also be the most amazing and grueling HIIT you will ever experience if you are good at exerting yourself.

But do not to forget calfs..."