Cut together a 15 minute Single Shot Interview Video

Need some help from an expert who breathes quick-cut-edits - They need to have a superfast internet as we're talking a few Gigs of Data I have a single shot 20-minute video in the following sequence. I need it cut together, with a start screen, some intro and some transitions. Setup is of Interviewer x1 AND Interviewee x 2 I will provide A Roll Video - Fixed Camera Angle A Roll Audio - Audio pointed to speaker 3 ( When speaker 3 speaks, we will need to use this roll's Audio) B Roll - Starts Randomly, End Randomly. Doesn't match the Frame Rate B Roll Audio - Has a zoom mic and we can use this audio when Lapel Mic isn't clear. need to clear noise from A and B roll Audio Sources 3) Lapel Mic - Interviwer 1 only has real god audio and we need to ensure this audio is used whenever interviewer 1 is talking. Task is to Cut these together into 1 Video File with carefully selected Audio, and add a background score with a few transition effects and starting and ending screens.