Realestate agent needed for a cash offer on a flip?

[Nirzhar Kar]

I am going to make some cash offers on some houses to flip so i need to try to save money anyway i can. But i am wondering if i need a realestate agent or not. How much % of the buy does realestate agents get in NJ from the buyers side usually? 

Also if i do decide to do this alone, what things am i going to have to do exactly? I am guessing i have to hire a lawyer to check the title and other things? Also my contractor will go through the as is house for his bid on rehab before i make the offer. So what exactly do i need the real estate agent for that i cant do myself? Stuff like comps i can just use zillow or mls to find myself i assume. (Even though my next thing i am going to do is get my realestate license).

Can someone tell me what % i owe the realestate agent as a buyer? I know it will be included in closing costs but trying to figure out how much . I will be looking to flip in NJ.