Server Maintenance 2012

I have a dedicated server with [login to view URL], it was recommended to me by another online worker. He initially transfered all our websites from the old server but no longer maintains it. I have had an email from the hosting company to say I have gone over my allocated space, I have approx 20000mb and i have used 23028mb. Also one of the domains is sending too many emails. I have a support tickets open and I need some help actioning their suggestions as I am not confident updating the server. There are 8 domains that can be removed to create space. I need someone who can look at the support ticket with me, check the breakdown of space we have on the server and who can give me some advice over skype. This is an easy job for someone who understands, servers, asp and .net and you could help me periodically if I need some technical help in setting up new sites. Ideally you will speak good English. You'd need to be available now, I have all the usernames and password to both the control panel and the hostings support site which is where I am getting the warnings and I'd like to start as soon as possible.