This can go in a lot of directions. It depends what you want to specialize in.
Here are a few build ideas:
Spellsinger focus (good songs, some nukes, crowd control, heals):
- 18 bard / 2 rogue
- max your charisma, rest in constitution and intelligence
- grab the usual metamagic feats (maximize, empower, quicken, heighten)
- pick spell focus and greater spell focus (either enchantment or evocation)
- don't forget insightful reflexes
Rogue focus (melee or ranged dps, basic songs):
- 15 rogue, 3 bard, 2 fighter
- go swashbuckler core 2 to increase the threat range of your chosen weapon
- assassin rogue or inquisitive, pending if you want to go melee or ranged (could even go Vistani here)
- single weapon fighting for melee, every good crossbow feat if you go inquis
- dex based, either way - rest in constitution and intelligence
- 3 bard gives you bardic inspiration (+4 to your skills)
Harper swashbuckler (melee dps, basic songs, very high trapping)
- 16 bard, 3 rogue, 1 fighter
- you need the Harper enhancement tree for this build, which you may not own
- Max intelligence, rest in constitution and charisma
- single weapon fighting swashbuckler
- intelligence to hit and dmg from the Harper tree
- probably your best bet to have high trap skills
And I could go own and own.
Other players will be able to give you other ideas.