At its best:
Plant two or three strawberry plants in a hanging basket or large pot of multi-purpose compost. Keep them well watered and ventilate the greenhouse on hot days - this will encourage pollinating insects, too.
As strawberries develop, cut off any long runners that grow, as these will divert energy from the crop.
Check pot-grown plants carefully as the fruit develops for signs of slug damage. And it's worth netting greenhouse doors and vents to stop the birds stealing the fruit as it ripens.