Woah in Mannheim? I'm not that far away!! I'd totally come over if it got organized. I can't suggest a bar or provide any investment or effort xD ( I'm poor and a physics student, too much to do and no money D: ) But I'm here to say I'd come!!!
Sounds awesome and I'd definately join, even though I live like 250km away. Unfortunately I'm not at home at the time. Since I support any of the barcraft events and I'm looking forward to any barcraft to attend to: My 2 cents on your questions.
1. Locations: I guess for the first events there won't be more than 10-20 (SC2-) people attending. So look out for a small or decent bar with TVs which is willing to give it a shot. If you have a room for 10-20 people, a decent TV or can borrow a beamer (e.g. from university) you can do it at home as well. I'm thinking about doing this myself in Giessen (Hessen).
2. Putting effort into it: Yes, but only in Hessen ;-)...
I have some experience in event organization. The most important thing will be spreading the word so that enough people come to participate. Everyone talks to their friend's, I_ll tap my connections to the nerd community in the region and we should have a Bar fullö of Starcraft, good luck and have fun!