The Tyne & Wear Metro was an example of not how to do it. The transport academics devised an approach where city-radial buses were diverted to Metro hubs instead, the last leg being (after going up and down steps, and waiting) on the new Metro. Even at Gateshead, from where you could see the city centre buildings just across the river.
Then came bus deregulation, and independent buses quickly started up running into the city itself. So now there was a choice. Guess what happened? The Metro hub approach was abandoned by the customers in droves, they far preferred a direct one-seat bus ride. The public authority held out for a while, but in the end gave in, and did the same.
There were plenty of precedents. In 1961 in Glasgow the new "Blue Trains" at Kings Park, on the south side, set up an interchange hub with the range of bus routes from further out passing there. Lots of publicity, through ticketing, but a notable failure, as the buses, guess what, continued as before to the city centre, while the trains, running at 10-15 minute intervals, were probably just running in to pick you up when your bus was most of the way there. This was described using various terms about the bus system like "unfair", or "should be stopped", as if the overall design should be for the convenience of the rail operator rather than the travellers.