Create/Modding my own Faction in SP?

[FlakXiion]

Hi Guys,
have now searched the forum for a long time and found nothing on the topic. I'm still very inexperienced when it comes to modding. I know it's possible I just don't know how Can someone tell me how to Modde my own faction in Freelancer Singleplayer? No new ships or anything like that. Just a new faction called "Libery Rebels" and flying around with Defenders.
I have already downloaded the programs Freelancer Explorer and FLEd-ids, but I don't know what to do with them.
Thanks in advance