BuddyPress.org

The hosting I have right now is with namecheap.com, the Professional Hosting with 100 GB RAID Protected.. I haven’t really that much of a clue about hosting I would need to make a social networking site with buddypress. I’d initially kinda know I’ll probly have to upgrade but idk if I need to from the get go, or later when I start getting more hits to my site. I’ll like to start playing around and build the site to get a hands on feel of how I want it. I kinda have a list of things I wanna incorporate into the site.
*buddypress
*myCred
*Buddypress Social
*Buddypress giftbar – or feeligo
*Captain up?
*cubepoints or something similar
*MyArcade Plugin – I wanna have a place where people can play flash games also – so I would put around 100-1000 games to play on my site..

and probly more plugins but I’m still scoping things out.. I wrote the arcade games site I wanna incorporte into my site asking how much space their games take but I haven’t got a responce yet.
So lets say I don’t have games on my site but later..
I’m confused about mulitsite hosting also, a networking site i read needs mulitsite Ability, I’m not sure if I have that right now or not because I dont understand lol.. So can someone give some ideas of hosting that I would need.. like:
windowns or linux?
I’ve only had experience with cpanel if that makes sence..Sorry I’m asking to many questions and I just wanna make my first step and learn hands on from their.. I just don’t want my first step to be the wrong hosting right from the start.. Thanks everyone and I have read alot of support pages here, I just couldnt’ find any about hosting..