There is no dermatological definition for sensitive skin, the term is used to describe the skin of those who easily break out in rashes, blotchiness, itchy or stinging in response to products or weather. The majority of us don't have a serious skin problem however, certain conditions like Eczema or Rosacea can make skin sensitive - so rule this out with your dermatologist first. There is no standard skin type for sensitive skin.
Moisturize/Hydrate as recommended in the section for your skin type. This is a very important step in treating this condition. Find a product that will provide a barrier and protectant to the skin. Ensure that products do not contain the above irritating ingredients.
Daily Routine - Step 4 - Sunscreen
Use a minimum SPF 15 or greater with a broad spectrum UVA/UVB formulation.
TIP: Look for sunscreens with natural Zinc Oxide or Titanium Dioxide as they are less irritating than chemical sunscreens.
As recommended in the section for your skin type. Ensure that products do not contain the above irritating ingredients.