kinda reminds me of lumbridge a little but not a bad thing i would think you should make it like you start in a town and there is 1 middle area that you can buy and sell at something like your sketch and there is 2 areas like banks and shops around the market area.
yes you should not there is anything wrong with that one include more areas as for a startup town to begin to show you merchanting,the local smithing,potion shop,arrow shop ect