I think the best option would be to do it on twitch, then offer "privates" via skype/tinychat for nudity shows, but if you do go another route:
The model I'm mentioning was on MFC. I'm far from an expert on cam sites and the style of camming they provide, but from what I've read MFC (myfreecams.com) is the most "social" and "community" based, so I'd assume that is the best one.
When I gave my suggestions though I was assuming you were already a model with a fanbase/following. Based on what I've read, starting with this plan might be a very difficult idea, specifically on MFC which makes use of a camscore rating, which makes or breaks models. Camscore is basically a rating which gives a model a numerical value based on dollars made per hour. The list of models that members see are then sorted based on camscore. So models with a low camscore go unnoticed unless something sets them apart from the pack.
New models get tagged with a "new model" status (for a week?). Viewers of MFC will flock to models with this status. Therefore, a models first experiences camming will often decide how profitable it will be for them. It is very hard to dig your camscore back from the grave when it is low, although a few models here have. Therefore, it is generally advised to start on a site other them MFC to make sure you have all the "kinks" worked out, be them social or technical. You might want to try just regular camming on a different site for a bit, before you jump into MFC with your niche fetish of gaming.
I'm guessing you can get a lot of technical tips in the model forum:
https://www.ambercutie.com/forums/viewt ... =24&t=1696 (how to get model status)
I suppose it depends if you are looking for a profitable career, or to just play, have fun and make money as a hobby. If the latter none of this matters, and I'd just try MFC or Twitch and see what happens. If you want to make this a job though, I would do a lot of research first.
I think girls gaming on MFC nude is a niche fetish that is very underrepresented on MFC. Hopefully not for a good reason. I'm curious to see where your road takes you.
I feel somewhat silly providing you any more advice, having no experience camming, so I would also take my advice with a grain of sand.
Edit: Here is a thread discussing the adult camming sites, and benefits of each:
https://www.ambercutie.com/forums/viewt ... 15&t=15320