My WC and my B had been sitting about a year since I last started them on Memorial day weekend. Had to pull start both with full choke to get them alive again. Once they got gas and oil flowing I could hand start them. WC still took full choke to get it to start by hand though.
Your carb could be out of adjustment slightly and hindering the starting. Best to pull start and get them running so you can adjust the carb. When I have been successful in starting my B after a long period I usually have to turn the power needle a quarter turn CCW to get it to fire.
I have start both with a belt and by pull starting. With a belt you need to make sure you get it tight enough and possibly one twist to get it running in the right direction, an extra operator helps.
Pull starting you need to run in 4th and let the clutch out, and be ready for it to take off, but have plenty of room, took several hundred feet Memorial Day to wake the WC up again.