[Koha] branch libraries

Davuilevu Theological Library (DTCL) currently installing Koha version 18.11 and also in the process of including branch libraries in 3 different campuses of the Methodist Church in Fiji. what are the requirements in having the branches all linked up to access and use the system. Do we need to install Koha in these respective branch libraries as well? Please help thank you Luisa Korodrau DTC Librarian Nausori, Fiji