I don't have all the answers sadly, but you will need to make a few files in .xml format. There are a few diffrent ways to do that but I like to right click where I want to put the file in file explorer create a new txt file and then rename the file to whatever I'm working on .xml. You may want to turn file extentions on in windows if it isn't on already to make sure its named properly.

I'm not sure how to do things in character editor but in prepare carefully next to the add button there is a button labeled '...' click that and you can add a pawn from a specific faction. pick a faction with a custom race and you'll add a member of that race. Unfortunately you are going to have to have the race basically done, as well as giving them a faction in order for the race to show up as an option in that list.

Can't say how practical it will be to have a race with only one member. You may need to do some stuff with C to do that.

Also my spellcheck is on the fritz tonight, sorry for spelling.

@ Greiger. Thanks, that helps quite a lot, i forgot about the.xml extention.
I found out how to select a different race/faction ect.
All i need to do now is make it exclusive. as in my character is the only one with this race. or at least make the race very rare.
Then there is the easy part, making my race.

The best way is to take someone else's mod and modify it, preferably a race mod that has no unique mechanic beyond what's in HAR.