[masraum]

Basically, you'll want/need to use a flash, but it also depends upon what you're trying to photograph. Will it be portraits where people are standing still smiling for the camera and you want them to stand out of the photograph, will it be active mobile kids tearing into gifts, a big group of people filling a room, etc...? Give us a better idea of what sort of photos you're wanting to take, and we can probably provide some more specific pointers.

ISO should probably be 400, depending upon the subject and purpose of the photo, you may want longer exposures or shorter exposures or a large depth of field or a shallow depth of field.

Also, you can do a google search for "indoor photography" or "photography indoor lighting" etc.... and get tons and tons of hits, but then you'll have tons of info to wade through.