The right spot can make your life easy. The wrong spot can drain your bank account quicker than you can say 'insolvent'. For a start, take the general area you're located in. For those of you who are not quite familiar with this term, it means information about the surrounding population. All this information is vital to restaurant success.
Suburbs change over time.
If you locate anything but a take-away there you're going to lose your shirt. The residents don't have the money or the time. Once or twice a year they bundle up the kids and traipse off to Sizzler. That same estate can be a different proposition at another time. Eventually, the mortgages get paid off or payments reduce in comparison to income, the kids get older and can look after themselves and the family has some spare money.