I am 3 years post op and dated a woman for 2 years, so I will try to respond to your questions.
As far as taste and smell goes, it's hard to say. I think this just varies from person to person. I never had sex before SRS, but I can tell you that the new parts definitely have a...vagina smell...not a penis smell. If that makes any sense.
The main differences I think between my vagina and a natal woman's are as follows:
-No matter how turned on I am, I don't really get wet
-My g-spot is AMAZING, but I have a hard time getting off from just clit-stimulation (though it is possible)
-I am tight as a mother->-bleeped-<-er
That being said, oral sex is still really awesome. It is definitely a process though! For the first few times, it felt like being licked by a sandpapery tongue anytime someone went down on me. But it got better over time, and now I really enjoy it! So I think you have a lot to look forward to