Not a website, but a book: What You Really, Really Want: The Smart Girl's Shame-Free Guide to Sex and Safety might be a bit much at 13, but by 15/16/17, it's going to be relevant.
(But it's on sale on kindle so she could certainly access it online.)
I think you should examine how you feel about blowjobs in general. Have you only seen them in porn where the girl has tears running down her face, and the guy is shoving her head down? Do you have a negative association from prior to the relationship? The bad taste comment is surprising to me-assuming he's just washed, it's only skin. Try to keep that in mind.
If you really want to enjoy the act, I would suggest you take control. Have your husband get himself off in the shower, then come straight to the bedroom. Let him lay down on the bed, then if you want to you can have him close his eyes, and tell him no talking is allowed, only moans. For me a big part of why I enjoy giving blowjobs is how much he enjoys it, so I'd definitely want my guy to moan.
Spend time looking at his cock, moving it around, smelling it, and lick just the outside. Don't put it in your mouth yet, try to see if the taste is still repulsive to you when you only touch your tongue to him. The goal here is not to get him off, just for you to explore and see how good you're making him feel. Flavored condoms were recommended somewhere on the thread, and they're certainly worth a try.
Not to overload an already super-long comment, but the fact that you hate his taste, hate your taste, get uncomfortable when he goes down on you makes it sound like you have a problem with sex overall. Try reading some books like What You Really Really Want and similar things.
Sex with your husband should be enjoyable. It's possible you'll never enjoy giving him a blowjob, but at this point it's way too early to give up! Good luck!
Well, the books that are about sex in general aren't all religious, but the ones that teach openness and that being sexual is ok are tending to be (which, if I think about it, makes sense. Religious women need validation that "god" ordains their sexuality). So it's either that, or books designed to pre-teen girls. Hard to sort through them. I settled on this book.