how do i put a logo on t-shirts, mugs, stickers and cars?

does anyone know any good companies or websites that offer this type of service ?

For relatively small runs, print on demand services like zazzle.com, cafepress.com or vistaprint.com have a selection of objects on which they can print your uploaded art.

Try searching for "promotional gifts" for more imprint-able objects.

Car wraps and banners might have specialty suppliers.