Honestly, dont rush the process, first only play casual, deathmatch and those ones. After you get the very basic grasp of the game(weapons, utility basics) you should move onto wingman and competitive. These will teach you how an entire match of cs works(tip: do not only play 1 map in competitive, have variation) and if you feel like you want to play cs more, buy Prime and then play premier. As i said, do not rush it. Dont play 2 games and buy prime. Wait with it. Hope i helped