Ok this is a two part question.

First question, thinking about rolling a necromancer theif assassin build. any suggestions? I was thinking a sneak blade alch conj light armor illusion dest build. Its for rp purposes. Hes a dunmer that only gonna use ghosts and undead and reanimate spells for necro, some dest for range, and gonna be a melee so alch for poisens and such. Im wondering about a bit of it, but it is for rp purposes. But was thinking la for sneaking and protection but I know its gonna cut down my spells power. Should I lvl up my security or rely on magic to bust open those locks? Hes gonna be a blend of magic user and physical, just trying to hit the sweet spot. Also should I still worry about la if I go vampire route?

2nd question, whats a good motivation starting out? I got the mod for alternate beginnings so basically gonna forgo the mq for awhile but I cant for the life of me think of what hes doing in cryodill. Was thinking that he came from morrowind to better himself kn necromancy since its very frowned upon there, but wheres a good place for him to go?

Preciate the help.