Yes, the peas, lettuce and spring onion can go outside nowish, depending on your local conditions, I'm also sowing outdoors carrots, root parsley, parsnip, radish, spinach, sorrel, all sort of salad leaves, sweet peas, beetroot and broad beans.
Brassica things can be sown in a cold frame.
And all sorts can be started indoors now I give an exception to cucumber, courgette and runner or French beans, which still can wait a bit.