I love to do redwork. Use a good quality thread - I've used DMC embroidery floss and also Sulky cotton - 12 wt - it's wonderful to work with and comes in many colors. I used a varigated orange to do a Halloween project. Usually the pattern will give you instructions regarding sizing the blocks but if not allow yourself 3-4 inches extra - you can always trim down. I've used muslin for the fabric but prefer Kona cotton.