The start is AT the BART station. J Church @ 24th is also an option as well as the 14 Mission bus.
You will NOT NEED BART FARE, MUNI FARE, pub funds, or any other such silliness on this trail. The on-on-on has $2 beers on Mondays and experimental DJs. Trail is not stroller friendly but is dog friendly, if you and your pooch don't mind traffic. Buritos and chineese food are available within 1 block and can be transported to the bar.