Affiliate Marketing Secrets

Me and my brother are starting a house/flat lettings agency. We are aiming to target a niche market, the DSS, pets, etc property hunter.
Currently I work as an insurance broker, as such I have a good knowledge of financial obligations that we will need to fulfill.
Really I am only looking for any additional advice that anybody may have, such things as approaching potential landlords, getting them to accept DSS, etc.
Thank you in advance!
(please, no off putting replies, I have decided on the nature of the company and have no doubts about what I am going to aim to accept)