Good for you. I applaud your efforts. I've been married for 7years and still uncomfortable with both giving and receiving oral sex. You have inspired to try more.
practice makes perfect.... you just gotta do it alot and you will get really good at it....trust me......i was like you, i never wanted to do it, until i met my husband and i felt like i wanted to......
you can use condoms but they dont taste great, get some flavored ones,,,,and there is lots of flavored lube .....ALSO they have new stuff that numbs your throat, sold at sex stores, and that blocks your gag reflex!.....you will score big with that!.....good luck
You get an A for effort. Back in my dating days, I've never met a woman willing even to try it. I've been married over 30 years and my wife tried it once for about 5 seconds and that was enough for her. Back to your question, if he cums in your mouth, believe me, you've pleased him.
Try going on line for tips and tricks or to your local book store. Between reading up on these and working on some vegatables first, Im sure you can please him in no time. For the saliva thing...maybe keep a bottle of water on hand? There are flavored lubes out there, not sure if you can use them hat way. Again look online a some adult shopping sites for ideas.
If you have any questions about the STD thing, ask your partner about using a condom. See if he's open to it. Explain to him that since he's more experienced than you are, you would feel more comfortable using one.