I am still pretty new myself but I can give you some info on my path. First thing you need to do it look at Sesserdrix's guide(
Link here). I think some of the level suggestions for certain camps might be a little off but its an amazing guide. Dudes like crazy good necro.
If you follow the guide for Levels 24-31, treants in south karana are the best. Will get a ton of plat that you can save up for a cos. However I went there at 24 and struggled a great deal in killing them. Might have been my inexperience but they resisted so many spells that I couldnt kill em. I came back at 27-28 and stayed there till 32. This is a well know spot and its constantly camped but eventually you will get it. From 27-31 I got enough for my cos. In my opinion spend what you have on gear so you can level faster to mid 20's so you can kill treants. The cos is useful but I don't know if its game changing. Still something you should save up for and buy. It will be getting nerfed in a few months and prices will go up. So get it while you can.
Secondly check out this gearing guide(
link here). Some of the items on it are definitely for later lvls but it does list some low to mid lvl items. Some items that i bought early on and cheaply were Savant's Cap,Silver Rose Engagement Ring, Bracelet of Woven Grass. I spent the majority of my bonechip money on a Stein of Moggok. It will be with you for quite a while. I focused mainly on int items then replaced some with stam when i got Call of bones at 34. Also while you are still in Kurns check out this
quest. Great neckless and not all that hard with a group and some luck.
Porting into WC can be tricky. There are 2 druids close by that will attack and kill you. All you need to do is invis before the druid ports you. You will still be invis after the port. Cant see you so they cant kill you. There are human guards and gryphons in both WC and EC that will wreck your face but if you are careful and watch where you are going you should be fine.
Also you dont necessarily have to go to ec to sell your bonechips. While i was in FoB i saw alot of higher lvls looking to buy chips. Either to lvl alts faster or rep turn ins. Most would offer a bs price of like 4-5 plat. Chips sell for 10pp a stack in ec. There is a difference in price yeah but 50% off is way too much when a port to wc costs like 30.I didnt take anything less than 8pp a stack in FoB.
Hopes this helped.