One sign to look out for is whether or not the other person is comfortable giving and receiving compliments.
When you share your experience do they indicate they’ve read your correspondence and were interested or amused by it?
Conversation is a two way thing and while email can be a bit clumsy it’s an indicator of whether a rapport could develop between you.
You don’t need to know someone’s entire back story before you meet them.
Spending time with them and seeing how they treat you and interact with the world around them will tell you far more than any amount of questions ever could.
When your relationship is still fresh, it's nice to get to know the silly basics of what makes your man tick.