Yes, it is a good idea to open retail chain. One such example is of RECOS who is RERA Certified and also have RERA Software as well, which can be very helpful for your business and will help you get your customers as well
Lot of well known builder and real estate developer also investing into retail along with constructing integrated township project. One such example you will get at 'Tata Housing Development Corporation launched GoodLife retail' on commonfloor website.
It will be really good to start any business at the starting. And as the township is new there will be more market opportunity as you might be the only supplier at the place for the time being.