i believe it's the woman at the counter in "divine elegance" in the imperial city. i don't know who tells you about her, but you have to have...oh, hold on: http://www.gamefaqs.com/console/xbox360/file/941875/42463 near the bottom, it has all the master trainers and what you have to do to get training from them
I believe it is Palonirya, who has a Mercantile skill of 80, and the Master trainer for Mercantile also.
In The Elder Scrolls IV: Oblivion, you can find five trainers total. The three basic level trainers are Esbern in Cheydinhal's Great Chapel of Arkay (Knight's of The Nine character only), Hil the Tall in Cheydinhal's Great Chapel of Arkay, and Jantus Brolus at Istirus Brolus' house in Bruma. The one advanced trainer of Illusion is Carahil at the Anvil Mages Guild. And the only Master Trainer of Illusion, Martina Floria, can be found in the Arcane University's Chironasium.
you must be socail everyone you meet raise freindship with money and for magic you go to guild halls and same for fighting my gametag master shadw
Master xehanort and master eraqus hope this helps!
you need to go up in the rankings of a trainer (trainer is the lowest)
The ability to breathe underwater in Oblivion can help you later on, but you don't necessarily NEED it. There is one quest, the quest that unlocks the master alteration trainer, in which you'll need to breathe underwater. However, at that point, you'll be at least an expert in alteration and will know the breathe underwater spell. Plus, you might not even decide to explore alteration.
i have no absolutly no clue
you can download cp trainer on a mac by typing on google : download cp trainer (the trainer you want) zip. by cp master yome01
It's a modification for the PC version, link below.
presto's edge close to the bridge
yes!
tell them to master the 30000 scrolls of farrt