I was in a couple of online D/s relationships and Master and i started out as online- and if it's manageable and appropriate webcam/voice software such as skype or yahoo are really helpful and do enhance the interactions. It means you can see and hear each other- and can hear and see her reactions more clearly.
I found a daily journal for me to complete, thoughts, feelings etc was wonderful. Email journals or even a journalling site that you can sign up to and friends lock- such as insanejournal or livejournal.com. Maybe set her a reading/research task to put into her journal that helps you both learn. For example what is SSC and RACK and then discuss the differences. Or self bondage for example.
Wooden spoon is a wonderful household item if she likes spanking, clothes pins, candles ( although be careful with this as a sub on her own can get a bit carried away with wax play- lol) Large cable ties for breasts although again be careful. Set tasks such as what clothes she can wear- let her show you what clothes she has and you can choose which ones you want her to wear. Maybe set her a getting up time if appropriate- just for control. Household tasks- such as cleaning while naked if appropriate.