Blowjob

I'd say it's best to talk to him about how you should do it and what he likes, so you'll experience it together.
I don't see it as disgusting - I mean you need to get around the fact that you'll take a dick in your mouth ... if that's ok for you, I don't think the real thing will be a problem.
As far as I know, swallowing is not dangerous. Some actually say it's healthy bc sperm contains a lot of protein. Sometimes it leaves a sour taste but I don't know if that's the case for everyone or if I'm just weird ╮(￣▽￣)╭
So yeah, basically my point is: talk to each other and find out what works out best for you. It might be awkward - but it's not scary or dangerous.
Hope that helped :)

Edit: If you want to, you can swallow but don't feel pressured to do so. And if you do want to swallow, don't just start swallowing right when he starts cumming bc sperm comes in (shots?? -> it's late I can't english no more) and there's a possibility you might choke or need to puke if you just swallow - I usually wait for him to finish and then swallow (that way you will taste the sperm more -> which is not (necessarily) a good thing but it's more comfortable (for me at least))