how many outlets can you put on a 15amp breaker ?
It depends on your local Building Codes, Local Electricians, what you think might end up using the circuit & if there's carpet...An average Upright Vacuum Cleaner sucks up (pun intended) most of the 15-amps. But, some used to say 6, then 8 then 10 & now I'm hearing 12. Some go with a "Rule of Thumb" being 1.5 Amps per outlet to arrive at the 10 number.
I prefer to do Home-Runs for each average sized room & might hit 8 which includes a single light. But, I also use 12-gauge regardless of whether I'm doing 15 or 20-amps on both ends, in case a 15 needs to have both ends bumped up to 20's in the future.
According to the National Electrical Code, there is no limit on receptacles in residential occupancies. Limits on commercial occupancies do not apply to dwelling units.
You are free to decide how many receptacles you want on each circuit.
The only caveat is, if you are putting 15 amp receptacles on a 20 amp circuit then you must have a minimum of 2 receptacles but there is no maximum.