Hi S.!
I kept my son's first birthday very low key, just family and my best friend. Even though he was a very outgoing, happy 12 month old boy, I thought too much stimulation would not be good. Even though he was so young, I still went with items he loved at the time: Seasame Street cake from Giant Eagle (tell them it's your child's first birthday and you get a smash cake for free!), Elmo plates, Seasame street, Barney, and Elmo balloons, and his favorite food...pizza!
I pretty much let my son set the schedule. We ate first, then opened presents at his own pace (it took over an hour, but was so much fun!), and lastly did cake. By the time that was over, he was ready to play quietly with his toys. It was a very nice, intimate party; something special for my little man.
Hope you find something great for your little guy!