First thing you'll want to do is use the command /hero choose class replace class with one of the following Warrior, Rogue, Mage, Cleric, Summoner
it should look like this /hero choose Warrior. After you choose which class you'll be take a look at your skills by typing /skills a list will show up of all your skills, if the skill is in GREEN you have access to that skill, if the skill is in RED you do not have access to it! You can look at more skills by typing /skills # replace # with a page number to show the page of skills you may have. If you would like to cast a non-passive skill type /skill name replace name with the name of a skill you can currently cast. While holding an item of any kind you can type /bind name replace name with the name of a skill, to be able to bind the skill to an item meaning you can right-click with the item in hand to cast the spell faster! Each class will have its own level bar meaning you can have Warrior level 3 while having Mage level 10. There is a bug where if you swap classes while playing the XP bar will not update so you'll have to disconnect and reconnect for it to update for you.