How do I convert my flash video clips to mp3 / mpeg & join them?

I routinely download video clips to Real Player from various sites. I move these clips to the hard disc and copy them to my pendrive. When I need to show these clips to my customers, I often find that they do not have a Real Player or Flash Player installed on thier PC.

There are various clips that would be better understood if they were joined and shown. What I would ideally want to do is this: -

1. Download clips from site to Real Player.

2. Copy clips to the hard disc.

3. When sufficient clips have been downloaded over a period of time (say two weeks and about 4 GB) join them as one single recording.

4. Copy this single recording to conventional DVD disc.

5. I should be able to view the joined clips continuously either on any PC or directly on the TV by playing on a conventional DVD player.

Since I am new to computers, I would be obliged if any one out there would help me in this matter.

Thanks a lot