The skill requirements put the limit at qualifying at level 7 and entering at level 8. The standard tricks for bypassing this don't work, no method can achieve four tricks.
The maneuver requirements are easily achievable through items, but if your DM doesn't allow that you can probably fit in the one Martial Study Feat you'll need.
Race: Doesn't really matter. I assume human or similar, but it's not needed.
here are five feat requirements. You get 3 Feats from levels, and possibly 1 from Human, forcing you to either dip, or take flaws. I assume your DM won't let you do that, because if not, this topic's question would be too easy to answer.
Thus, the dip. Due to the way you gain 1/2 initiator level from non-initiator classes, even numbers of levels are best. So a 2 level dip is probably best.
Fighter 2 is probably best if you don't want to lose BAB, but 1 BAB hardly matters, so here's some alternatives and their comparison with Fighter 2:
Sleeping Tiger Monk 2 - Lose 1 BAB, 2 HP on average, gain 2 needed feats just like fighter: Improved Unarmed Strike, Improved Initiative, on top of that, gain Weapon Finesse, +2 Hide, Wis to AC, Evasion, 2 more skill points/level.
Cobra Strike Monk 1/Cleric (Darkness Domain) 1 - Assuming fractional BAB, this loses 1 BAB and 2 HP on average. It gains 3 needed feats: Dodge, Improved Unarmed Strike, and Blind-Fight from the domain. You also get Wis to AC, +2 Escape Artist, one other domain, and the ability to cast from cleric scrolls later, partially negating the BAB loss.