If your only running one wire then you will only have one circuit. You might branch that off to two or more devices but only one circuit. Your lights alone if on togeather will eat 10 amps.

If your going to the time and effort to run the wire I think I would go larger. You can get 100amp 220 wire drops, Around here called trailer drops at a reasonable price. Very similar in cost to burry rated 10/3. This way you have 220, larger wire for less voltage loss, room to grow if needed. Your only real additonal cost is a ground rod and a small breaker panel.