Ok I am new to this place but I do know BG2. I have beat the game as a ranger but became fallen one cause a certain cleric pissed me off so I am made a new char.

A undead hunter - Good one to be?

my question is what kind of strong hold does he get?

You get the paladin stronghold - in the temple district

Be careful not to 'fall' this time ;)

If you fall can you gain it back?? If not i think you should somehow be able to, but then again i dont know all to much about D&D, so I can see why if you make someone above you mad they would be vengful.

i read somewhere you can if you get enough rep again and do the stronghold quest. But if you already did the quest then you'll stay fallen ranger or paladin.