As a type II fan myself, I can say that you don't have the range to make it to the Atlantic and back. Just about the only traffic you're going to find are small single merchants going to and fro between GB and Norway. If you stay close to the shore you'll find more traffic, but on the other hand, you'll run into more aircraft and destroyers too.
This game is definitely not fast paced, and it has a steep learning curve. Patrols consisted of days and weeks of boredom and just hours or minutes of sheer terror. This game
will try your patience (but that's half the reason why we play).
Lastly, bear in mind that this game is exceedingly complex and it has a lot going on "under the hood". Unfortunately, it was rushed out the door and support from the development team had to be dropped after a few patches. This could have been the perfect game if the team had been given enough time to work on it. Mods do a lot for the game but can't fix some of the core issues. Given the above, it's still the best WWII sub sim and the only real option for many sub fans.
Have fun, and sink them all!