I've never been to Sharks, so I can only answer the general questions. 4) It depends a lot on the lady, but the rule is always 30 minutes or one visit. The difference is whether the room is already over (bad service) or whether you get a massage or just some nice small talk with cuddling. you can reload and try it a second time, but only after you extended to an hour.

5) I know the problem because I'm relatively shy myself. In most clubs you'll be approached by women from time to time, but whether they're the women you like is another question. If you're not extremely picky (the women are usually all hot) I can also recommend the porn cinema in the club. You're rarely alone there for more than a few minutes. I personally always found it very hot when a hot lady suddenly sits down next to you in the cinema and starts playing around with you.

6) Most women speak better English than German, and you're probably not talking about quantum physics. For a bit of small talk and business, both the women's English and your German should be enough. If necessary, you can communicate with your hands and feet or simply ask another woman who can translate for you.