quick question. a couple years back, i first started my company, filed for sole proprietorship business license with santa clara county. did some shoot for about a year and half then closed up shop because i had to relocate overseas for work and didn't want to keep paying the business license when i won't get any business from photography.
since i've been back, i've been thinking about reopening and was chatting with some of my photography friends. most of them they tell me they just have a EIN #; which for some are just their SSN#. they didn't register their company name with the local county, so i assume they didn't file for any business license.
i can see how that can benefit someone who's doing part-time, which is what i'm trying to do to get back into the game.
so my question is, how do i go about in getting back on track? my website was still up and never closed off, so the company name/ logo is still there. also, how do i make sure no one else can register the same company name as mine?
thank you all in advance. greatly appreciate your advise in helping me get my ducks in a row. 

