I just downloaded dbo and i was wondering if i could get any tips on this game. I want my character to be of the human race so which class should i choose.

First of all, welcome to the forums!

If you are indeed going to pick the human race, the choice is between selecting a Fighter and Swordmaster. If you want to have a high hitrate (meaning you hit mobs most of the time), pick a SM. If yu want to be able to dodge a lot of attacks then the Fighter is the way to go. That being said, if you can acquire equipment that can raise your attributes in either then it really doesn't matter what class you pick (In my opinion).

Just be weary that a lot of people pick fighters/swordmasters so your chance of completing TMQs, Dungeons and other group related activities are much less than if you pick a character from the namekian or buu races respectively.

You forgot to mention the Spiritualist classes Turtle and Crane

I did too. I'm not entirely sure about these two classes because I haven't personally played them but from what I hear from my friends, that a Turtle and Crane both have their positive and negative aspects which again can be fixed with acquring the right equipments.

If your set on Human i would pick Turtle or Crane. Swordsmen and Fighter are over picked.

Short description Turtle for PvE Crane for PvP. But both can excel at pve and pvp just need right gear build and know how.

Turtle is the best for begginers but they need to take physical def armor or mix physical and spiritual cause most of the mobs do physical damage and if mobs swarm u in lower lvls u wil die cause u dont have aoes that could kill them in one or two shots and ur defence is too low

lololololololololo go turtle hermit man... we are the underdogs in the game, but we still rock. overall i would say turtles the weakest, cause DW have massive LP. positive side is that turles are getting giant kamehameha.so if u want to be the best i would say crane
I MEAN... i am really strong in the game and im a turtle hermit with a good build and some epic armor... but who knows...