In my opinion, bard’s should have either 12 or 19 starting Charisma.
If you go for 12, you’ll never invest points in Charisma, focus on strength or dexterity, and rely on finding a belt or headpiece item with an enhancement bonus by lvl 5 to access your 3rd level spells and then using enhancement bonuses on items throughout the game to hit 16 Charisma. This sort of bard will be a summoner and/or buff boy who will also have enough points to start with an 18 in strength or dexterity and have a good enough to-hit chance, but you’re giving every bard spell with a DC. Like all 3/4 BAB classes, you should avoid two weapon fighting, but have options. You can sword and board in light armor with weapon finesse and a dexterity build to be a pretty solid offtank with mirror image/blur/displacement and your summons. Similarly, you can invest in strength, have a bit less armor class, but invest heavily into dazzling display and the strength to dazzling feat (intimidating prowess, iirc). You won’t do much damage, and will just be a buff/debuff/summon machine. Or you can invest in strength and a 2-handed reach weapon and rely upon attacks of opportunity. Or grab a bow and be a decent archer.
Alternatively, you start with 19 charisma, out 4 of 5 of your attribute growths in Charisma, and focus heavily upon casting. You’ll want a bow to keep you out of harms way, not that you’ll deal any meaningful damage with it. I like pairing this with Thundercaller because the charisma helps the DC of thundercall.