After the seedlings are about 1 or 2 inches high, thin them out leaving only the healthiest plants. Carrots grow well in most climates. They prefer full sun. Carrots do not require much fertilizer. During the winter you can add ashes from the fire place to an area where you want to grow carrots the following spring.
Onions are great companions plants for carrots.
Thin carrots when they are about an inch tall. Potatos Potatos like rich soil and sunny well drained beds. Buy potatos that are certified virus free for planting rather than grocery store potatos. Plant potatos a couple weeks before your last expected frost date. Potatos like loose soil.