[Koha] KOHA OPAC

Hello morning, I would like to know more on how to acquire KOHA OPAC, our library belongs to the small library and we don't have an online library system. If you have given us a chance to acquire your online library system, may I know the requirements, the system use or software use. to be honest I did not understand how to install the system, although I read your articles but still need further explanation. Thank you very much in advance. God Bless .