IN 3K OR 5K YOU SHOULD RANDOM A TANK!!! 5% extra gold which can help immensely, either to get a diff wep or get a wep without having to walk to the cp. However, if you are very new to btanks, go for a helicopter as it is one of the easiest starting tanks imo. get the basic tank cannon at lvl 1 - gives you 60dps at 900range, then either the stun rocket or the first aoe ground stun skill. The passive movement speed boost can be good, however only get it if u are vsing air tanks in your lane. You can however get it vsing ground tanks at lvl 6, 9 and so on.
This is what i think pros do. At lvl 9 DONT SPEND THE STAT POINT!!!!@##%#$^% Save the stat for when you turn lvl 10 so you can put it on your first skill AND ulti rather than getting basic tank cannon or w.e.
Another thing is, if you want to learn to play, watch the pros and observe how they play and how they counter each tank, wep, strat etc. Eg. countering hunter by getting air, countering goblin tank by getting air or a tank with a instant stun, to stop it from stunning you, countering air with demon tank, long range with tp and short(er) range etc.
Its also good, once you get better, to play people better than you. If you get stacked against, you have to play defensively, and try not to feed. Its always a good learning experience to lose to people better than you, as you will most certainly learn a trick or two.
That should almost cover everything combined with the info others have contributed.
have fun playing btanks.
