If you are not familiar with that camera, I would get to know it well before the first shoot. Also it would benefit to have multiple cameras going at once. At least one hand held, and one on a tripod.
Don't just use one memory card for many reasons. Download time will be very long. If there is a card error you are screwed. It is great to have multiple cards so you don't have to format the used card to reuse it, and can just leave it as a backup.
If you plan on using multiple cameras keep in mind that some use different kinds of memory cards.
Back that shit up. Don't leave the site without at least 2 copies of the footage on separate devices, preferably in separate bags.
Using ambient light sources can be problematic. Lamps are a different color temperature than window light and it looks unprofessional when mixing multiple sources. Window light can change from minute to minute depending on the weather. There are some inexpensive options out there to get a more consistent light. You want soft light, it is much more forgiving, and you want to be able to control the angle and distance etc..
Finally if you ask any film student they will tell you sound is just as important as picture. No one wants to watch anything with bad sound, there are a lot of options there as well but you definitely want to get the sound worked out beforehand.