The BB missions for cargo hauling work great to get you out of your sidey and into a hauler or Adder. After you get to a hauler or cobra, the BB missions are just icing on the cake if you and happen to be headed in the right direction.
Once you get into a Conbra, the rare trades become a very nice way to make good money. Rares also work well in an L-6 or an Asp, but it is about even money if you can find a good local route. Here is a link to play with the rares:
http://eliteraretrader.co.uk/
Once you get into an L-6/Asp, and don't want to do rares, there are several trading tools out there to help out. Some people consider using those tools "cheating" because your not doing the footwork yourself, but to each their own. here is one such site:
http://www.elitedangeroustrader.co.uk/
Right now I am in an Asp, and I do the rare trade circuit. Right now I am on a loop that encompasses about 70 or so systems worth of rares. It is not the most profitable way to do things, but I enjoy it. I also get sidetracked hunting at NAV points, and doing the odd mission along the way.
Another great site for hard core taders is the reddit page:
http://www.reddit.com/r/EliteTraders
You will find that in general, people are stingy with their routes, as they do not want them to get over saturated and kill the run.