Welcome to the joy of all-grain brewing! The process of BIAB doesn't change the recipes at all. Brew whatever you like. Hard water, yeah, well.... personally I wouldn't worry a lot about it unless you detect pH problems or weird harsh flavors in your homebrews. Otherwise, no worries. You can start out by brewing kits, or use recipes from books or magazines like Zymurgy and Brew Your Own (I still do that quite a bit), or pick up a copy of the book Designing Great Beers that really does a great job of teaching you how to design your own recipes from scratch. The only thing I would caution you on when looking for recipes is that I wouldn't trust many of the recipes you might find randomly online via Google searches or whatever. It's better to know the source, and in general it's a little better to get something published in hard copy or that's been reviewed by many homebrewers if you want good ideas. Also it's safer to avoid any recipes older than like from 10 years ago; try to find recipes a little more recent. Homebrewing wasn't quite the same in the old days as it is now, i.e., we've come a long way, baby. The exception to all rules of course is this forum, where we have some really smart homebrewing dudes on here who can help you conceptualize and formulate good recipes anytime if you're interested, just post something on here and you'll have pretty good answers within a matter of 48 hours or less.
Cheers, good luck, and welcome to the forum!