This is basically like asking what you should talk to anyone about.
Say you're on a date or just hanging out with a friend. What do you talk about?
...Well, idk, I'm socially awkward. Why do you think I ended up doing tulpamancy to begin with?
But the point is, they are no different than anyone else. It can be hard to maintain a conversation with anyone, and the same goes for a Tulpa.
The only issue with Tulpas, at least when they are still in early development stages, is that they may not really be capable of driving a conversation or having interests or topics to talk about, leav