Early sowings outside can always prove difficult  due to the cold and wet soil at this time, therefore, by warming up the soil of prepared areas with cloches it will protect from frost and rain.
It is ideal to leave the cloches in place for at least two or three weeks when the soil can be raked prior to seed sowing and planting out of young seedlings.

Replace the cloches giving the young plants a good start.

Do keep a sharp eye out for slugs and snails with the use of slug pellets if needed, do read the instructions especially if you have pets... Chickens are especially stupid and will eat the pellets if they can so personally I place everything under that builders net, its easily found on the net and comes in a variety of colours, it also stops the cats from digging the soil for there toilet duties and wreking  the seedlings at the same time, mind it doesn't stop them going to sleep on your young plants unless you put suporting canes underneath.

Happy planting