Any good tips on early spring planting on vegetables?

How soon you can plant depends on where you are. Here, the ground is frozen and will probably be frozen for another three months. Peas and other early vegetables (lettuce, radishes, spinach, etc.) can be planted "as soon as the ground can be worked," in other words, as soon as the ground is thawed and reasonably warm. I've found that peas and other seeds won't germinate well when the temperature is cold, no matter what they say. I wouldn't plant if there was still snow on the ground. I don't understand or know enough about the potato question, so I can't help you there.

peavey gave you some great answers! As soon as the ground can be worked, I plant peas, sweet peas, beans of all forms, kales, spinachs & all members of that family, and radishes. I mix the radish seeds in with the kale & spinach, as they are the first to sprout, they mark the rows, and you aerate and loosen the soil when you harvest them..as they are a short lived crop. For all forms of potatoes...the soil must pass the "trou" test..LOL!!! That means you can sit quite comfortably on the soil without your trousers on!! One large potato can yield many seeds..chop the potato up INCLUDING an eye with each portion. The eye is whence the new plant comes from. I have nearly 900 Garlic plants that I put in last October, up nearly 6 inches. Love my Garlic...and love to share it. It will be another 2 months before we can plant on the West Coast of B.C., lower mainland. Looking forward...ah, Spring!