(a) For any or all said purposes, the council may divide the town into districts, of such number, shape, and area as may be deemed best suited to carry out the purpose of this act. Within such districts it may regulate and restrict the erection, construction, reconstruction, alteration, repair or use of buildings, structures or land. All such regulations shall be uniform for each class or kind of buildings throughout each district, but the regulations in one district may differ from those in another district.

(b) The council shall provide by ordinance the manner in which the boundaries of such districts shall be determined and established and from time to time amended or changed. However, no such boundary shall become effective until after public hearing in relation thereto at which parties in interest and citizens shall have an opportunity to be heard. At least fifteen days' notice of the time and place of such hearing shall be published in a newspaper of general circulation in such incorporated town.