For the sake of completeness, here's the same analysis done with a character who is truly unarmed (not wearing spiked gauntlets).
The situation is this...
Human Fighter Level 2 (2 BAB)
Because the character is unarmed, if attacking an armed foe he will provoke an Attack of Opportunity.
The damage for an unarmed attack is 1d3. In 3.0e, this is non-lethal damage. In 3.5e, this is subdual damage. (But don't worry about the distinction - they work the same way.)
If your character is wearing gauntlets (not
spikedgauntlets), the damage is the same, but is normal (not non-lethal/subdual) damage.
14 str
15 dex
How do a standard attack action and a full attack action work without feats?
For a standard attack, your attack bonus is +4 (+2 BAB, +2 Str), and you do 1d3+2 damage.
As your BAB is only +2, your full attack is the same as your standard attack,
unless you choose to use Two-Weapon Fighting. However, the penalties for doing so are huge: -4 with your main hand and -8 with your good hand.
So, that would give you two attacks, the first with an attack modifier of +0 and the second at -4. Each attack does 1d3+2 damage.
If you add the Two-Weapon Fighting feat, your attack penalties are much reduced, to 'only' -2 with each hand. In this case, you would get two attacks with an attack bonus of +2, each doing 1d3+2 damage.
Remember: in all of these cases, you'll provoke Attacks of Opportunity!
and including these feats what changes?
Improved Unarmed Strike
With this feat, you no longer provoke Attacks of Opportunity. Additionally, when not wearing gauntlets, you can choose whether to deal normal or non-lethal/subdual damage.
With this feat, you will gain a +1 bonus to all the attack modifiers listed above.
Power Attack (If relevent)
In 3.5e, you cannot apply Power Attack to light weapons (including unarmed attacks). So this feat will have no effect.
In 3.0e, this restriction does not apply. In this case, you can choose to take a penalty of up to -2 on
all your attacks in the round, and add the same value as a bonus to damage on a successful hit.
2 Weapon Fighting? (dunno if this works or is needed for unarmed combat)
See above.