One thing that's absolutely crucial for you to know is that most/many aspies have difficulty recognising emotions, and they also see things in a fairly black-and-white standard. There is very little "inbetween" in an aspies head, which is why they struggle with "gray" areas such as romance.
Now, onto your question(s? I'm not sure). Sorry if I come out a bit bossy, but please only take the following as suggestions. Try and make your feelings somewhat clear, but don't treat him like a five year old. In terms if the pacing, don't worry about it. Aspies tend to (in my experience) pace to pass the time or well, I'm not entirely sure WHY exactly, but I tend to do it whilst fiddling around with machinery of some form or talking to somebody whilst I'm thinking about the conversation to a large extent. The way that things are for me might be slightly different to that of the unidentified him, and vice versa, so please don't take any of this as what he WILL be like.
I wish you two the best of luck, and a merry Christmas too, I suppose.