So yes first of all, yes I'm new bought the book half a year ago loved the game, asked some friends if they would like to play and now I have a group.
Anywho I have this idea for a run which would be based on the movie 'Running Man' the idea I have so far is some run has gone wrong in aztech territory they get cought and now have to do a show where they have to fight gladiators

My real concern is that people will think that this is railroading (something I try to avoid) and how to get them in aztech territory and make sure that they survive, as best as possible but as rule zero goes plot never survives players, so if people have any ideas that can help please post them.

The easiest way is having exactly that info as backstory for your campaign. It´s only railroading if there is only one solution for every situation.

If you plan a run as "on this run, they will fail, be captured and put in a gladiatior pit", leaving no chance for them to successfully finish the mission, then yes, that is railroading.

If you prepare the scenario, then give them several runs, and in each one they *might* get captured, and you have the scenario ready for any time they fail by some combo of bad choices and bad luck, but they also have some possibility of succeeding each and every time, then that's good writing and planning.

I agree that itis best to just have the prologue be backstory. Just start the campaign with the runners captured

You could always just start the run as "Previously, you were hired by company X to do Y and Z went wrong and you were captured- luckily relatively unharmed. You now have to fight for the amusement of the Aztech population, your mission is to get the hell out of this with your hides intact.

Wait, you're planning a run based on the running man?
Got a grand price waiting for the victor in the end of the tunnel?

If this stunt is run by the Azzies, the "grand prize" for the "victor" would probably be a very nice, very public, very honorable ceremonial de... whatever the fancy name is for having your heart cut out.

Apart from that, depending on your players, the backstory/prologue thing might be interpreted as some very strict railroading... But if your players trust you to get a good, entertaining game going nonetheless, it would save you a lot of buildup time, letting you cut straight to the real run... Skip this pretense and cut straight to dying!
Sorry, I don't know where that random emo-quote suddenly came from...

Grand prize will be their lives and gear, with some modifacations here and there, and a safe passage out of aztech territory.

The campaing itself is already on it's way, this is a run I'm planning but then again two players went gung-ho in a corp building bellonging to one of the triple A's so I might make a sort of revenge thing let them run a red harring where the intention is that they get cought.
There will always be the chanse of them gunning down the captors beforehand thought and if I know my players that will happen.

If you have a run like this you want to do in the middle of a campaign, the Riley37 probably has the best advice. But as it's the first game, it's probably acceptable to tell the players that you want to start the game with a particular scenario, that this is how they meet and that after this introduction which establishes setting, character, rules etc., it'll move into a more open game. Players are usually pretty understanding and you need to start the game somehow.

The runners are hired for a run outside the sprawl and when the plane lands they discover that the Johnson pulled a bait & switch on them and they can either play the game or stage a daring and almost certainly fatal escape, which also happens to be recorded for trid. Either way the corp wins and alfter it's over the Runners can sooth ayn ruffled feathers by tracking down the Johnson and making him play one of their games.

Another idea is to steal one of the plothooks from New Seattle, the Runners are hired to play the game and are given "laser tag" weapons only to find out that the other side has real guns. (The plothook involved the army training base in Seattle.)

Personally, I love this idea, and I think Ravor has the best scenario for getting the runners into the gauntlet. Or you make this gaunlet a known shadowsport then the players might even seek it out themselves, maybe let them know that they might earn a point or two of Street Cred for surviving. Hell, their mission could be to sabotage the games, which would have a ridiculously high chance of getting their hoop in a sling. I imagine the security system would be as lethal as the games themselves, hehehe.

Because having relatively well 'trained' targets with their fangs pulled is still fun!

not sure what you'd do about the mages to make their spells laser tag friendly tho... 'okay guys here's the situation, we've completely screwed you over, your weapons are fake and your opposition are shooting to kill, Good luck, oh and Mr Combat mage sir, please stick to force one stun spells as we don't want any of our guys hurt ... Thanks!'

My old group would have been Okay! I'm gunna wait till I see half a dozen dudes then Hellblast the entire area, drain be damned.

I'm sure there are spells for that and not well then I'll just make up some supression force field which adds something like a +3 on drain tests, the mage will learn not to use to many spells.