Help me set up Minecraft server plugins and Pex file...using CMI plugin for ranks... possibly small plugins too.

I am a 52-year-old mom trying to help my son with his first MInecraft server and while I feel we have some good ideas I don't have the know-how to get it working well. I'm having troubles with the PEX file and setting up some of the minigames and gadgets so that players can use them. I also need help setting up a few VIP Buycraft listings and an Enjin website for the server. In starting this project I have learned a lot but I really need the help of someone with experience and some creativity. If we are successful in making the server an interesting fun place for kids to play in a family-friendly atmosphere it could turn into a bigger project in the future. I'm sure there is a creative person out there with Minecraft and plugin know-how that could help us.