Well first thing you want http://www.ornitocopter.net/v3-0-release/ It improves the graphics and sounds. Also it adds fixes to the general game. Morrowind is a much more slower paced game than Oblivion and Skyrim. I suggest you speak to every npc in the starting town, they give you valuable information. The combat at first is atrocious, but once you begin to level up in your chosen weapon style, the combat improves. The number 1 complaint all newcomers have is "why can't I hit anything?" The key is the character has to have the necessary skill level in order to land successful hits. In Oblivion and Skyrim you can be a master of multiple weapon styles. In MW this is not possible. I suggest picking your main method of attack as a major skill, usually that skill will have atleast a value of 30, meaning you'll be able to hit more. Talking about skills you have Major skills, Minor skills and misc skills. Major skills level up the fastest and are usually the ones you use the most. Minor skills level up at a more moderate pace. Misc skills hardly ever level up, since you don't use them often. So my advice is make a custom race and add the skills you are going to use most as major skills. Be warned though you can only choose 5.
Factions: In Morrowind you cannot be master of all guilds. Each guild requires you to meet a set of requirements. If you do not meet these requirements you will not be able to join. So that means no pure warrior being Archmage, and master thief.
Also their are three Great Houses, these houses are the ones with all the power in Morrowind. You can only join one in each game. There are Redoran (warriors), Telvanni (Mages) and Hlaalu (diplomats/con men). Again in order to join them you have to meet their requirements.
That's all I can think of. If you need more assistance feel free to ask.