whats the fastest way

Member/Non-member?

 

For members, your pretty much looking at Yak-hides (bodies, not rope) or bowstrings.

You can't exactly make battle staffs, snakeskin is also out of the picture in comparison to Yak-hides because of the difficulty of the quests needed for it as well as the guide mini-game thing.

Clockwork items might be good, but I have never used the method and it has potential.

Jewelery is good for crafting, but don't expect results for a long time because everyone buys gems, you'd have to invest for results.

Cheapest crafting for members would easily be bowstrings or Yak-hide, Yak-hide being just a little ahead I believe but longer though since you can easily buy flax and gain profit, whereas you'll have to pick up Yak-hides.

Glass isn't recommended, since you're only going for 3 levels, although it breaks even and it is quite fast if you know how to do it.

 

For non-members, it's jewelery and hard-leather. Hard-leather being cheap if you get it yourself, otherwise a chunk of your money because you're only going for 3 levels. Hard-leather is easily beaten by bowstrings, seeing as you'll have to dye the leather and such.