PLEASE don't listen to the people telling you to let your baby "cry it out"..... Do research on that. Its just not human nature, babies cry for a reason. Thats what parents are for, to soothe them and respond to their needs :)
Think how they must feel laying there crying, not knowing whether mommy/daddy fell off the face of the earth or not - and getting no response! ugh, i hate that method so bad.
Good Luck in what you decide, do what feels "right" :)
I have an almost 7 month old daughter, and until she was around 4 1/2 months she slept in her swing (cradle type) most of the time! And I say, oh well, if she was sleeping that way, who cares, lol... Then I started putting her in her crib with a wedge to keep her on her side and she did pretty good. She also didn't really like being flat on her back either. Once she was rolling really well I started just putting her in there kinda cocked up on her side a little and I let her find her comfortable position :) She still isn't the best sleeper but its getting better :) Hang in there