If you've got a deadline for this Monday to get things up and running... then you are going to struggle. You can't rush this, you need to do your research, take things slowly, understand what it is you're doing.
Are you sure LMCE is right for you? Are you just looking for a media solution? If so, then mythbuntu might be better. Or, do you need the home automation side of things as well? If you're in that much of a hurry, consider a pre-built/supported Dianemo system from Andrew (totallymaxed).
Not trying to put you off, just trying to be realistic.