Character Notes
Basically, you have two strategies:
1. Be Invisible: Stealth and Full Attack, using Rapid Shot to make three attacks, at +17, +17, and +12. Restealth every time at no penalty. Because you’re sheathed, these attacks always deny DEX to AC, and they’ll be Touch attacks within your first range increment so they’ll ignore armor/shield bonuses as well.
2. Be Mobile: If you’re already visible, for whatever reason, Move and Attack. This is automatically a sneak attack, though it doesn’t deny them DEX to AC. It does, however, make your skill higher (+21). You can move up to twice your speed, and you can shoot at any point during the move. Due to higher skill, it’s probably a good bet to use Deadly Aim (like Power Attack but for ranged weapons, and anyone can do it without the Feat due to the house rules): roll at -3 (+18) for +6 to damage. You can also try to Stealth while running since you’re not penalized at all for full movement while using Stealth.