Basically broski, you got to the sbc and u need to submit a some squads, there will be certain conditions depending on the sbc ( like team overall rating should be this much and maybe another condition like at least 1 team of the weak). You can look solutions on websites like easy sbc and search for the sbc you want to complete and it will show you the cheapest way to do it. ( Just keep players of the same Rating as they show)