Freeside is right next to the New Vegas Strip. Find the Lucky 38 tower and circle the barbed fences until you find one of the two entrances. Freeside is also one of the ways to get into the strip, but you must hack the securitron, submit to a credit check (2,000 caps) or get a passport. The other way in is via the NCR monorail, at Camp Mcarran, but you will need an NCR disguise.just next to the Crimson Caravan Company. If you don't know where Freeside is, just follow the Main quest line. you'll eventually get there.