hello as a start for making an tanker (dra)goon, you will need terra as your main affinity, since this is the affinity that you base all your skills on, your second skill is optional, but often used pyro for some dungeon requirements or ferus to counter flora users.
and you would like to go for def/resis to spend lvling points on, as it benefits you later when class change is done to guardian as second class + increase critical dmg +1%
if u go hardcore into it, later, i will recommand you to make resistance focused boosting gear + embeds, infuse resis stone, mantra build possibly for resistance aswell and the mantra requiers good resis glyps, and resis signets well recommanded, when you have all this ure closing up on an nice super tanker.
once second class is decided you should go for mountain fortitude boost it as high as u can + demon star which will make you capable to boost up fast and become an great tanker