What your favorite weapon for low rank (Silver 1 - Silver Elite)??

I guess with your low rank you could try using the P90 as its fairly easy to control its recoil. The recoil is just up so you have to move the mouse downwards, and its pattern has no horizontal variation. On the other hand you can try to use the AK47 and M4 and learn them as they'll be important to master later on in higher ranks. Try downloading a workshop map called Recoil Master, it will help alot. And make sure you have a low sensitivity. I recommend 2 sens with 400 DPI, but you can change it for less or more as you prefer.