Beware of traps:
(1) Armorer and Medium Armor do not have their master trainers in Morrowind. In both cases, it's a bug in the game. Either fix the bugs by means of the game editor or have a mod with master trainers of these skills.
(2) The master trainer of Speechcraft trains only members of the Mages Guild. If you don't want to be a mage then you will need a mod with a master trainer in Speechcraft.
(3) The master trainer of Security trains only members of the Thieves Guild. The same as above.
(4) Heavy Armor is really heavy in Morrowind. If you plan using Daedric Armor then you will need a pretty good constant effect boost of STR. No such item exist in the game, you will need several custom enchanted items and lose several "enchantement slots" this way.
IMO, the best armor in Morrowind is the
Light Armor. You will use the glass armor in the end. The glass armor is more than enough effective, moreover, there is a very nice artifact in Tel Fyr. And you can secure a full set of the armor! Save the game before your first entering Ghostgate. Check the armorer inside. You will usually see that it offers
almost full set of glass but something is missing. If it happens then restart and try again. It's only the matter of patience: in the end, the armorer will offer a full set, including a tower shield. That's what you want to achieve, return later, with enough money
The armorer will still have the full set.