Infrastructure around any new stadium would be in conjunction with the council/gov but should have its own parking - possibly shared with the college - so no need for a bridge unless it improves accessibility .
As for a station, with the amount of new houses planned for that area I’d expect that there are already plans for a stop somewhere within that area given the move towards environmental impacts.
Ideally as their are two train lines either side of the area, a station on both lines would be ideal allowing the station to be used for concerts or other events which would create extra income and with two station one could be used for away fans and one for home fans - but I that’s more of a pipe dream.