Thought I wouldn't consider myself an experienced player, my piece of advice is: Don't expect to learn much from the "Quick Mission" generator. In most cases, a snapshot torpedo aimed at the first possub will get you a kill (and a "Kill goal complete"), which is way too easy and probably not what you (or me) are looking for, i.e. the basics of submarine ops. Instead, I would suggest to play real missions, i.e. those provided with DW itself, or to download some. Subguru's page really is a good place to look for those. Actually, DW is much more than a modern "sub game", it's more like a modern "anti-sub" game (which, naturally, includes sub as sub hunters), and the problem I had (and still have) with the stock campaign is that many missions are simply much easier if you use some platform other than a sub.
So, bottom line: Keep looking for user generated scenarios if you're specifically looking for submarine missions in DW
