According to the Pathfinder Core Rule Book:
On page 17 (Table 1-3: Ability Modifiers and Bonus Spells) a Charisma of 19 would give a +4 modifier to CHA and 1 extra bonus spell for 1st-Level spells.
In addition to this, on page 72 (Table 3-14: Sorcerer) a 3rd level Sorcerer only can cast 5 1st-level spells per day. Your Charisma score bonus spells would be added on here, allowing you to cast your selected 1st-level spells 6 times per day.
And finally, on page 73 (Table 3-15: Sorcerer Spells Known), a 3rd level Sorcerer would only know 5 0-level spells and 3 1st-level spells.
So, to answer your question, your 3rd level Sorcerer would have the following:
0-Level Spells: 5 known, Unlimited times per day
1st-Level Spells: 3 known, 6 times per day
This is without your Bloodline bonus spell at 3rd level. Including that you would have the following:
0-Level Spells: 5 known, Unlimited times per day
1st-Level Spells: 4 known, 6 times per day