1) new transformation will be in future releases.. so in 1.2 or further.
2) some new moves will come in 1.1 ( that is almost out ) like kame torpedo. beam jump, earth spirit bom. and more
3) you can download models from
http://filedb.redsaiyan.net/filedb.php?action=category&id=19
4) for more info about the models check the model section that is
http://forum.esforces.com/forumdisplay.php?s=&forumid=7
5) for some moves you need to be SSJ to use the new moves you didnt had in normal mode.
6) you transform by pressing the Z button on your keyboard. but you need a sertan powerlevel to transform. as for gohan you need 1.000.000. and goku 1.750.000. and vegeta 2.000.000. just see in the character info list before you choose a character.
7) you can get more powerlevel to kill or hit whit your attacks
hope this anser all your questions