The first thing you need to do is keep an eye on the incision area. Usually there will be some slight bleeding in the area. When I had my gall blatter removed the incisions seeped for about a week after the surgery. You need to replace the bandages as needed when they absorb the fluids. Your doctor will have you apply an antibiotic ointment to prevent infection.
You might see some redness around the incision this is normal. If the area becomes swollen and very red or painful contact your doctor. You should keep the area dry for 24 hours to prevent water getting into the stitches which might cause an infection. You can take a sponge bath instead of a shower to help keep the area dry. It is better to wear clothing that is loose fitting and white in color. Clothing dyes can cause infections if the dye gets into the incision. This is especially true if you have had foot surgery. You should wear white socks not colored ones.
Depending on the type of surgery you should restrict activities such as lifting, straining,or sports. If the area is bothering you make sure to apply ice but make sure to keep the area dry.