OS X V10.7 Lion :: Burn DVD With Lion That Plays On Dvd Player?

I just got new imac version 10.7.3 LION...2.5GHz intel corei5, 4GB 1333 MHz DDR3 Desktop.  It has no iDVD.  I cannot use my old applic. install Disc that had iDVD ( iLife08)  because when inserted, it says I can't open it because Power PC apps are no longer supported.  NOW, an Apple Care tech. did not tell me that when Ijust talked to him.  There is no way to get iDVD then for my new computer.   

MY PROBLEM:  I want to burn a dvd that will play in a DVD player. I created it from my dig. camera using iMovie. I tried to burn it to a DVD/RW but when inserted into two different DVD players, nothing. I then read I needed a DVD-R, and got that, but read that will not work on this computer either. I read of something called BURN which is some free software that does simple dvd's, but am afraid to download that and end up running in circles.  I sure do not want to purchase some software for a rare occasion when I want to burn a DVD for a friend to play in his tv/dvd player.   

how can I get my video from iMovie burned to a dvd that will be playable on a simple dvd player?I still have my old computer in a closet.  It seems absurd to think I must drag it out, hook it up and use that when I spent all this money for a new computer so I'd be in some cloud...

Info:
iMac (21.5-inch Mid 2011), Mac OS X (10.7.3)