Need help with final stages

Hi

I'm looking for a bit of help with the final stages of a repaint

I've been using various tutorials and a lot of trial and error to create a mythical airline for myself using the pmdg 747-400 paint kit and photoshop cs5.

Unfortunatly I've got to the point that I've created my livery and converted the relavent files to dds files but I'm now stuck I've looked at the tutorials and on youtube but the links are either dead or not what I'm looking for.

Can someone please point me in the right direction as to how I now go about getting it into fsx so i can then adjust what i'm sure will be quite a few mistakes either a tutorial or youtube video.

I have been watching and using the dantrix youtube video's but as they're based on the 737ngx I wanted to start on something a little less complicated first