After talking to some beginner interior photographers lately I think it is time to recycle some of the old exposure fusion/flash hybrid posts that we've done here on PFRE in the last couple of years. Here is why:
So my advice to any beginning interior photographer is simply shoot some brackets and add a on or off camera manual flash to one or more of the brackets. You'll start to get the feel of using and triggering flashes and eventually if you want to go totally small flash either get Scott Hargis's ebook or video series. In the mean time you can dependably do shoots and deliver very acceptable results with the EF/Flash hybrid technique.
Here is a list of more detailed posts on how to use this EF/Flash hybrid technique:
The last lighting technique poll I did showed that Exposure Fusion/Flash Hybrid is the second most popular shooting technique behind multiple flashes. There's a reason for this! It works pretty well and it's easy to learn while you build up to the ultimate technique - multiple off-camera flash.