For best results apply with your fingertips and massage in like you would a moisturiser. If you would like more coverage under your eyes, blend in concealer after applying the tint. Apply with a dry sponge for sheer cover, or a damp sponge for a heavier finish. Cream foundation gives heavier coverage than liquids but still blends to a velvety finish. The best thing about cream is that the consistency can be controlled, so apply it sparingly and try mixing it with your moisturiser, or mix shades to get a perfectly natural match for your skin.
Liquid foundation is the most versatile of all foundations.
If that's a bit out of the price range then try L'Oreal Feel Perfect, Cover Girl Balancing Liquid Make-up or Rimmel Soft Finish. These are particularly good if you've got problem skin because they offer thicker coverage. However they can be drying and can look 'caked on' if you use too much, so apply sparingly with a damp sponge and make sure to choose a shade that matches your skintone exactly. Estee Lauder Minute Make-Up Stick Foundation for a smooth finish.