Hey, I'll assume this account is a brand new account.
Step 1: Find a target with a large friends list. Add him/her, and make your location details similar to theirs
Step 2: Go to google images and type anything that has the words, 18 year old girl, in it. Then make it your profile pic. That or go to your main facebook and use someone else's pictures for more fake proof you "exist"
Step 3: Go to "Find Friends" and check your target's name. Begin clicking random people. Click about 40 or so and then relax for awhile.
Step 4: Add more pictures of random things or make status updates. Liek a few pages too
Step 5: If you make a girl profile, you should have instant-accepts.
~Have Fun!~