how do I wire and drive 1 motor with the 2 outputs of the L298n motor driver module? (parallel the outputs)
The L298N is a quad half-bridge (or a dual full-bridge) driver. By tying OUT1 and OUT4 together and tying OUT2 and OUT3 (and, of course, the corresponding inputs), you get a higher current output, full-bridge (or H-bridge).
Take a look through the datasheet for the L298N. It has the exact application description you are asking about on page 7.