the start of blighttown is after the depths which again do not have any warp points,the nearest warp point would be the sunlight altar,so you would have to pass half of the undead burg and then the depths just to enter blighttown (then again,why would anyone want to play 10fps-town from start again)
the other start of blighttown would be drake valley,but you can't enter through that without the master key (if i remember correctly)
The fastest way to the depths and blighttown would be from firelink shrine - shortcut past female undead merchant - junp down right before the first butcher - shortcut after the bonfire, it´s like 1 or 2 minutes to get there so it´s not that bad.