Thank you both very much, helped me a lot

But one more question, i've had a few people tell me that i shouldnt put TP into Fire Rose, but just into the explosion skill,
good idea? because what i've seen so far, (i got to 30/25) it doesn't do a lot of damage, but evidently the explosion skill does.
Or is there another way? Or is it just " in time ... " sort of thing?
That's the opposite of what you should do in my opinion. I have 0 points in explosion and have Fire Rose at 70. Fire Rose is an OK DoT, but what it does for you is give you a little mdam buff that procs every 30 seconds, so that's why I use it.
While you level, you may want to use Explosion if you find it useful, but at endgame the damage buff is what makes it great, not the Explosion. When you kill bosses in instances, skills like Fire Rose Explosion are of limited usefulness because Flame > everything else. The other stuff you cast during a boss fight is intended to make your Flame hit harder or crit more (like Plasma arrow)- not to do damage by themselves. The damage buff Fire Rose gives you makes your Flames hit harder every 30 seconds or so. The DoT itself is so little, it doesn't add much to your dps, but the buff does.
Don't feel bad about putting points in Explosion if you like to use it while you level, just do put points in Fire Rose- you will want it later.