eBay

Should i stick with the same category when selling on ebay or is it okay to keep listing in different categories?Like if i sell clothes should i just stick with that and will it bring in more traffic or will it matter?

If im just getting started, do i have to create a business account or can i resell on my personal account ? Or which would someone prefer if i plan on trying for a while ?

I am completely new at this and have sold 3 items so far that I haven't spent any money on, but I am confused about how to track my profit or predict what profit I could potentially make after fees.Also how do you track all the sales tax, and fees an...