This is probably the stupidest question, but what are the best guilds etc for a warrior to join to practice his skills with? I have never finished the game in the 5 years ive had Morrowind, so I want to finish it now. Also, what location for that guild should I start at?

I am currently thinking: Fighters guild, Great House Redoran and the imperial legion. Are those 3 good?

=/ @ 5 years. I haven't even finished Oblivion. *sigh*

Those are the most geared towards fighters so you shouldn't have too much difficulty meeting the skill requirements. I also found the Imperial Legion questline the best in the game, and the Fighter's Guild has some interesting politics going on.

The Legion and the Fighters Guild are good choices. For roleplay reasons, I'd pick Redoran or the Legion, not both. Just bear in mind the majority of Redoran quest rewards are a bit pants.

Depending on your character, you could always invent a backstory for other factions, but the Fighter's Guild and House Redoran are obvious choices. The Legion fits if you're not a Dunmer-loving type.

The first Imperial Legion quest presents you with a moral dilemma. If that bothers you, there IS another solution to the problem, but it takes a lot more effort to find.

Redoran, Legion, and Fighters guild are the best choices.

Never actually completed a guild, though, couldn't find one that allowed me to use my spear as one of the advancement skills.

legion.

but as mentioned several times, the ones most friendly to "pure" warriors is fighters guild, legion, and house redoran.

depending on your specializations as a warrior, you might do well in other factions. for example, if you use blunt weapons, you might do well in the temple, and imperial cult. if you use long blade, you've got one of the skills of the east empire company.

here, take a look and decide for yourself

http://www.uesp.net/wiki/Morrowind:Factions

(It took me longer to find the quickest route...)