Not a lot of sex experience- help!!

My boyfriend and I haven’t been together for long, but we’re of course sleeping together. I don’t have much experience from before I got with him so I’m still a little shy with some things.

Sometimes when we’re having sex, he’ll put his fingers in my mouth and I’m so awkward and have no idea what to do. Am I supposed to suck on them or is that weird?? Do I let them just hang out in my mouth???

He also licks and sucks on my ears sometimes while he’s fucking me, like he’ll full on lick the inside of my ear which I looooove. It gives me goosebumps and feels really good. But I feel like if I try to do it to him I’ll mess it up and it won’t be sexy at all. And idk I just need tips. I can’t give him hickeys because of his job, but if I just try kissing his neck I feel like I’m not doing it right and it’s not hot for him.

Advice??