The solution was to add the the audio asset to my level and then click on the green ADD+ button and add the asset from the list. If the asset is already selected in the level, then it will appear at the top of the like.
Now you should see a waveform of your audio in the sequencer, and you can scrub and play back
I don’t think there are start and stop, at least not in 4.11, but I could be wrong. You can right click on the waveform and trim or split the track. if you drag these trim points, they effectively become start and stop.