I'm Borderline personality disorder with some definite avoidant tendencies that I just don't know how to overcome.

I've met some really great people recently (as I have in the past) and would like to keep in touch with them. One is the real estate agent handling my new home purchase. I have no idea how to proceed once the house is ours. I suppose I can always call and invite her to coffee, but what then? Is it like dating? Do we move up to lunch, then dinner, then double dating? Movies and shopping?

I'm just so bad at making friends, being friends and staying friends and it has been so very long since I spent much time around women I barely even know how to "think" female any more. I haven't had a girlfriend to do things with since highschool, and that's 30 years ago. I feel like I'm so much different than other people, other women in particular, that they just won't get me and why go through the bother. I can't take the first step. I'm fine if someone else does, but unfortunately, no one else has in many years, which sort of reinforces my idea of I don't quite fit.

Any advice (other than "go for it") would be appreciated.