I have worked for this national rental car company for a couple of years, the operator of my store was fired

she was the owner operator of a store that is part of a major national chain. I have been offered first shot at becoming the new owner operator. They have told me it will take about $2500-$3000 to take over, I have to get an LLC, workmans comp, and I am not sure what else. They have said that my credit is going to be a factor. Can anyone try and explain what I need to expect to do to get this and what about my credit, how big of a deal is that and what for. ?