Well you have to pay monthly fee, then you have to pay for tracks and lastly you have to pay to unlock parts and cars (last two are buyable after loads of racing as you get some ingame money by racing - I'm not sure if tracks are payable by it as well).
Uhm and paid trial is joke.
As for classes - currently there is 1:10 EP and nitro and 1:8 nitro. In future they wanted to add 1:12 scale and offroad (I guess in very distant future considering how long it took to release current game).
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