That's awfully ambitious; that's twice the starting commute I had under similar circumstances (I commuted by bike for a year before quitting smoking, but that last year was a serious bit of 'tapering off', I never felt the need to smoke until the 'pedaling high' wore off). Depending on the bike you get, your allotted time may be a little tight, too.

I'd love to see you be able to do it, though; there's nothing like the rush of a good bike commute -- it's BETTER than napalm in the morning! (LOL)

I would suggest, though, that you look into the possibility of mixed-mode commuting; how is the bus system there? Do the buses have bike racks on the front? Do they go near your job? You could ride the bike partway there, the bus the rest, or however it works for you. Later, as you 'harden up' (and it will take time -- my normal rides now were epics just a few years ago), you'll be able to tip the scales further toward the bike.