Dumbbell Workout Suggestions?

Hey everyone, newbie here!

I was wondering who all has had good results from working out at home with a set of dumbbells. I can't afford to join a gym at the moment, and already have a set of modifiable dumb bells that can go up to 50lbs or so, so I figured this would be a good way to help create some muscle. I walk for about 30 minutes a day (so I'm getting some cardio in there), but I'd like to step things up and ensure I keep burning once I get home.

Does anyone have any reccomendations for routines, or youtube videos/DVDs I can find on the subject? My biggest concern is staying safe while I work out (as I already have crappy wrists and elbows) and not tweaking anything, so any suggestions you might have would be great!

Thanks!

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