To win a domination realm your tribe must reach 80% of the total village count, of the top Ten tribes
I think you must stay at 80% for either 7 or 10days after declaring I can't remember one of the two... if you go back under 80% it stops and you have to go above 80% before declaring 'domination' again
To win victory points realm you tribe much reach the total amount of points stated in the realm description first ( so 2000, 3000, 3500 etc etc ) A victory point is earned every time you have a presence in a province and the whole tribes victory points add to give the current total... therefore eg a vill\s in 20 provs = 20 victory points.... ten members with 20 victory makes the total 200 victory points at that instance