I know the phrase "just be yourself" is old and over used, but it works very well. I tried it and I had a few friends on either my first or second day. I was mainly friends with the gamers/cool nerds but I eventually befriended most of the school. I did however stay away from the Plastics, D-bags, and the Stoners. I would however refrain from expressing your special interests to other people unless you actually know they like the same things, and also try to not let your autism show unless people are actually cool with it, or if someone else has other similar disorders like ADHD or OCD.
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"If the country is good enough to live in, it's good enough to fight for. With privilege comes responsibility."- Private Eugene B. Sledge