If they are the average sized ramekin i would probably double the recipe.
Remember your cooking time will be less as they will cook quicker. I would start checking after 20 min, they are done when you touch the top and it spings back! Will be easy to overcook....
You could serve them in the ramekins no prob, no need to take them out.
Strawberries don't bake as well as raspberries, i wouldn't recommend that substitute. I used frozen berries as fresh were about $10 for 200g when i made it. Alternatively you could use blueberries....
HTH