And how does this game expect low level Sisters of Fire to get any crafting components?

If you get too little score every time, then sister of fire is not your class to play. With good performance you should have enough resources to gear up your char on low levels with no problems. Later crafting will cost much more and even with premium (which doubles the drop rate) you will be forced to stop on some levels to farm more resources.

I am level 2 and i only have fireball which does 150 damage, how am i supposed to get high score?

Invisible inquisitors also come and attack me from the back and instakill me, cant see their attack since they are invisible too

try to play soebody else.
How i'm undestand - sister is not your...

Show me a game where you got top score as a Sister of Fire at level 2 as a Beginner.

Maybe, if I find some time and people, at the middle of may I will present some video tutorials.

Heh, i was first at almost games before 5 lvl.
Just practice at Russian server. But, at all, if you so hard with inqs, i'm advice you change class. Will be worst with 10 lvl. Really.
Try to read my basic guide. Some thing were in it .

Looking forward to it, SoF seems tough at lower levels, i just want to kill things with spells and girls with badass armor and weaponry, maybe thats too much to ask

Play much more and you learn how to block invisible ink.

That's weird. I find on my Ice Witch that the assassins are the easiest class for me to kill. Easier than dwarfs. When they come behind you to power attack, they come out of invisibility before they start the power attack action. You should be zoomed out and paying attention so you can turn around and defend it. Then you just burn the hell outta em.