Ranks system of Tanki Online is pretty simple. The higher your rank is, the better upgrades and protective paints you can buy. If you've got enough crystals, of course. So if you don't have enough crystals you shouldn't be in a hurry until you get a tier 2 turret + hull M3 package with a descent protective paint.
Though it is permissible to buy any modification of gun, hull or paint on Leutenant, it's hardly possible without donations. So again, the slower you level up, the better.
Of course every tanker wants to become a Marshal. Aside from having fun from the game itself, the main goal of playing Tanki Online is acquiring the highest rank. So after getting an M3 package with an expensive paint I advise you to buy a Score multiplier pass. Since you’ve got all the above I also advise you to consider buying supplies on a regular basis. First of all you'll get more fun from winning in drug wars, than from loosing to drug lords. Second, with Double Power you'll be able to kill more enemies, hence you'll be able to acquire more points to level up.
Play Tanki is not a name - it's a call! Play Tanki Online - the best free 3D multiplayer tank game! Combine guns / turrets and hulls, play Deathmatches, CTF and TDM games and upgrage your tank. News about the upcoming sequel - Tanki Online 2.0!
This is basically a rank table of Tanki Online. Want to know best tactics to become a Marshal? Check it out!