BRRRR - Who pays monthly costs?

[Mellinda Thaxter]

Hello folks, I am new to this world and trying to understand BRRRR in its entirety. My husband and father-in-law are in the costruction field - over 40 years hands on reno/building experience between the both of them. Assuming I don't have any money for d/p and reno, am I to understand that the HMLs will loan me these funds? Who pays the monthly mortgage during the reno phase? Is it that you rent it after reno is completed? Thanks