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Sunny 16 rule applies when the sun is out. Just keep shooting to learn how film acts in low light. Experience is the best way to do it. Learn to push film.
I recommend a flatbed scanner. The software really helps you and you can scan 12 frames at a time and go make breakfast or something. If you do a DSLR, you will take a picture of a negative and then figure out how to make the colors come out right. It is more involved than checking the "make negative" box in photo editing software.
Color film has a orange color to it that turns blue so you gotta figure out how to get rid of it. And because you have to manually do that for each picture, it isn't that fun. Yes you get higher resolution photos that way, but seriously consider the reason why you need higher resolution pictures. If you ever post on /p/, imgur, facebook, or anything online, then the flatbed is more than good enough for that. I get prints done from my flatbed scans and they look great. I use an Epson v600 and the software does all the cropping and color corrections for me and labeled the file names in order for me as well.
tl;dr - DSLR for scanning film is a jacked up workflow to ease pixel counters, use a flatbed scanner.
