Foolproof easy way to put apps on a DVD?

This may sound like a basic question to everyone else, but I have tried, unsuccessfully at times, to put applications on a DVD. The computer I am getting tomorrow has No backup CDs at all for OS, or anything else. So I have to make sure I do it right. Also, I bought MS2007 office which I have to dowload and want to be sure I get it on a DVD correctly. I have had too many computer issues in the past so now to feel safe I want everything backed up to DVDs for applications, and I backup data to both an external HD + another backup on top of that.