i think its good that your willing to help people out, because i know all too many people who get a server, put there own game server on there and thing "gee i could do this - all i'd need is a webpage" and they get too it.
This topic should idealy be pinned for people to look at before they get started, its not as easy as you thing guys (been there done that myself, but the datacentre had some serious network issues so everyone left

). Getting clients is hard, you cant just sit back and wait for orders to come in.
I would think to start a game server company you would need at least:
- Money for 3 months server rental of at least 2 servers at 0 profit. This means you can afford to pay for the servers for 3 months, and have the money waiting not "oh i'll take it out of my pay as it comes" because you cant garantee that pay or that you will have the funds availiable at the time.
- Money for a website, this can cost you between 100 and 500USD, a good site is not cheap. Sure you can use a template monster but then people who do their research on a company will see you have the same design as another company and will stay well away from both of you. If your site does not impress, the potential client will run off! It cost me $300USD for my site design and all my clients loved it!
- Advertising funds, Advertising on gaming sites varies from about 100$/month (blackbagops.com) to that much per week (one of the ctrlaltdel-online.com banners, top is $50/week though). You should be able to sustain this for at least 1 month, and understand that the advertising is there to increase awareness NOT get you signups there and then.
- Google ad words. You could be paying 10-50c/click though and you will get ALOT of them.
- Support. You need to be able to do the support yourself, and be availiable at all times or hire people you can trust to do it. Not just someone who you pay a dollar a ticket to who has full admin access to your box, someone you can meet and either know or get to know. Also you should get a billing system with ticket support or a ticketing system, which could cost you between $50 and $200 all up.
- If your on windows you WILL need something to keep your services running. On linux most games have a auto restart system, and you can add them to rc.d so they come online straight away in the case of a system failure. On windows you could use FireDaemon (see my sig for discount) to do this, or some control panels you can rent will do it for you too.
- Voice services, if your want to run these as included extras or stand alone purchases you MUST buy a license!
These are the absolute basics your going to need to spend money on.
All up if your using SuperXeons you will be looking at needing almost USD$2000 to get started. And your not going to get much profit right away!