Basically correct. But a few things to consider:
Most new circuits require AFCI and/or GFCI. AFCI is generally best handled at the breaker. GFCI can be at the breaker or at the receptacle. Locations needing AFCI or GFCI vary depending on the version of the NEC. Generally speaking, kitchen, bathroom, garage, unfinished basement, laundry room and outdoor receptacles all need GFCI and most others need AFCI.
Based on additional details, this is feeding a shed, so GFCI is a definite requirement, and weather resistant and an in-use cover are also requirements. Note that even with WR receptacles, GFCI is more vulnerable when outside, so that is a point in favor of using a GFCI breaker, despite the additional cost.
A 15A breaker can be used with 14 AWG or 12 AWG wire, or larger. A 15A breaker can connect to any number of 15A receptacles - 1 or more.
A 20A breaker can be used with 12 AWG wire or larger. A 20A breaker can connect to any number of 20A receptacles - 1 or more. Or it can connect to at least 2 15A receptacles. A standard duplex receptacle counts as "2".
So you can't connect a 20A circuit breaker to only one 15A receptacle. Either use a 20A receptacle or a duplex 15A receptacle. Or use a 15A breaker and a single 15A receptacle. While most of the time more receptacles is better, there are situations where connecting just 1 receptacle to a circuit is the right thing to do, as long as it matches the breaker.