I have always done in-home childcare for the last 5 years, ever since my first child was 9 months old. It always worked out well. This year was the hardest, because I am watching 4 all together and that makes it hard (almost impossible) to get out.
Watching 2 or 3 is easier and nicer. My best advice: invest in a double stroller and/or wagon (depending on how old the child/children are).
I'd be happy to answer any specific questions.
Its always worked out well for us, been a lot of fun, brought in extra money, and taught my children a lot about sharing/ patience/ getting along.
Down side: EXHAUSTING, much harder to keep up with the house, (although, on the other hand, we HAVE to tidy up each and every night so that the apartment is ready for babysitting the next day- the place never gets too out of hand, simply because we HAVE to keep it picked up for babysitting) and even if your child is napping, *someone* is always awake, so no "down time."
It's been a good experience for our family. We love and remember all the children we've babysat. Never had a problem with any of the kids...some of the parents, on the other hand, have been difficult. make sure you click with the parent before taking a job. You can learn to love and enjoy any child...but not every grown-up, LOL!