I would recommend you to play aikido more than judo (as proto said). Stick with intermediate(correct me if I am wrong, but I guess that's the server for green belt) servers for now, start out with small amount for some items are QI (no. of games played) restricted.
As you are a beginner I don't recommend betting much because there is a high risk of losing your TC.
About play style, stick to the intermediate servers, and eventually you well come up with your own style/opener for mod like aikido. Some of the mods are opener heavy (example- judo), so you might consider learning some common openers, you can search for them in YouTube. You might even make your own derived openers.
For future
When you get better in TB, and know how to manipulate your tori(player) in a better way, you should learn to spar, that way you will learn to play even better.
Hope I helped. Sorry for grammar.
Note : I am not really a pr0 player, so maybe some informations are wrong(not likely to be). But if any person realize that I have written something wrong, please correct me.