The shack gives 1 MAP per 8 hours. You need 3 MAPS to send 1 character to prospect for 1 DEED. Land costs 1 to 7 DEEDS. If you want to send all 5 characters you will have to save up 5x3=15 MAPS
Read these https://tstoaddicts.com/2021/11/24/northward-bound-prospecting-new-land-part-1/ https://tstoaddicts.com/2021/11/29/northward-bound-prospecting-new-land-part-2/