Capturing the Attention of Boys, First Time GM, not a Pervet Options

[MADness]

I'm going to be running my first game in a week or so, and my group will be four or five teenage boys with minimal rpg experience and no Shadowrun experience. I have a set of street level characters that I think would be fun for them to play. However, I think they would want there first game (and possibly only, a couple are supposed to be moving soon after) to be at a much higher level of powe. I'm just not sure how to do it.

I know that starting with the High Life rules is a good option. What I don't know is how to take the characters from that point to being truly veteran runners. I would appreciate tips on this, and possibly on running a game for a group of this kind of make up.