I always prefer to speak to them over the phone, it is much more personal and tone can't be misunderstood on the phone. I always ask the basic questions over the phone. Hours, days, where they live (for school zone), what they are looking for from a daycare. I then go over basics, my philosophy, my basic day, how many children I care for, my family (how many kids, married etc.). Then I would set up an in-home interview and after that I email them that same night if I am interested in them as a potential client I email my contract, policies, handbook...all that good stuff. I also always let them know I am also interviewing other families for the spot (even if I am not) and to please let me know if they are interested in the spot so I can choose the best fit for my daycare. This allows me to step back and reflect on the interview to decide if it really is a good fit before I say yes to someone. Good luck.