This is a good place to start. Here you can find basic informations, installation guides, troubleshooting tips and latest compatibility lists.
If you have already browsed through the wiki and kind not find the right answer or unsure, take a look at the forum and USE THE SEARCH function, to see if someone already had your problem. If not, you are free to open up a new thread
Do you wanna get in touch with the most active people supporting the LinuxMCE project, then join us on IRC