The benefit of the feat Magical Training says
You can cast three 0-level arcane spells per day as either a sorcerer or wizard (your choice, so long as you have a score of at least 10 in the ability that controls the spellcasting for that class). You must make this decision when you first take the feat. Thereafter, you... are treated as a sorcerer or wizard of your arcane spellcaster level (minimum 1st) for the purpose of determining level-based variables of the spells you cast.
If you choose to cast spells as a sorcerer [y]ou know two 0-level spells of your choice from the sorcerer/wizard list.
If you choose to cast spells as a wizard, [y]ou have a spellbook with three 0-level spells of your choice from the sorcerer/wizard list. You prepare your spells exactly as a wizard does. (Player’s Guide to Faerûn 41)
Does a creature that takes this feat either gain the Sor/Wiz spell list or gain a spell list limited to those spells he knows or something else? Further, can a creature that picks to cast like a wizard prepare and cast additional 0-level sorcerer/wizard spells that the creature adds to that spellbook or is such a creature (if he picks no other options for wizard-like spellcasting) stuck with a 100-page book containing 3 pages of spells and 97 pages of doodles of him in wizard hat or whatever?
(Gaining the Sor/Wiz spell list—which, for example, enables the use of Sor/Wiz wands—by taking a lone feat can be a fairly big deal at low levels when making a DC 20 Use Magic Device skill check is still a challenge.)