Here is a non-spoiler walkthrough created by Samurai Bandit from GameFAQs: http://www.gamefaqs.com/portable/ds/file/955057/56440
You'll probably want to start at the section called "Getting Back what they took from you", which explains how to get pass the guards (Ctrl+F to look for it quickly).
Good luck.
in the duel runner shop or its the computer rally doesn't let you on
Summon it in a duel
First you go to your Duel Runner menu in Story Mode (click on the icon that looks like Yusei's Duel Runner). Select to edit your Runner, scroll down to sheilds, and select it to edit them.
Stardust Dragon can be obtained in "The Duelist Genesis" booster pack, or as a gift from Yusei Fudo after defeating him an undesignated number of times in a Duel or a Turbo Duel.
First you need to unlock your duel runner when yiu buy it. then when you have the enginle and cpu, go to the old highway and you can ride
Unfortunately you cannot face one of your Turbo Deck recipes in a Recipe Duel.
duel runners are the whole point of yugioh 5ds otherwise it would be just like the rest:)
just like in the original yugioh 5ds after you get your runner and deck back from the impound center trudge vs you and then you meet Leo and Luna . hope i helped
The best Duel Runners are Yusei's and Jack's frames. (Both have the same exact stats.)
The fastest way would probably have to be doing the Duel Runner races. Go into any Duel Runner parts shop and go to the computer on the right wall to do them.
Sorry guys I moved it to the question In Yu-Gi-Oh 5D's Stardust Accelerator World Championship 2009 what are all the parts for your duel runner again? So copy and paste them question and you will find the list.
You get a guard outfit and card key from Blister and you sneek into the security impound center were you have to sneek around until you find your deck and duel runner and escape.