Logo design needed for t-shirts and car door magnets.

Need a logo made for t-shirts/polo shirts. T-shirts can have something designed to be printed on the backs of the t-shirts. Polo shirts would only have something on front left chest. The t-shirts/polo's I am buying are Red/Blue/Green/Black. Bright colors, but dark colors also, because of the nature of the work we do, we pickup and remove old, dirty, broken electronics, and typically get our clothes dirty because of it. Images for Car door magnets would obviously be much larger. I don't know the formats, if they can be scaled up. I would need finished images in format that a typical t-shirt/car decal business would use them in. I would prefer my URL in the logos as I don't believe my end customers would find me anyway else. We do e-waste removal anywhere in the State of Texas. Because that encompasses so many cities and towns, I don't think I would necessarily come up in any given "city name e-waste removal" search. I would want them to come to my website directly, and feel that the url needs to be included. You can use any fonts, any colors you think may work. Remember that your logos need to look good against the colors of the shirts/polo's I've mentioned above. We service the entire State of Texas using a box truck. We pickup and remove computers/laptops/tv's/cell phones/routers/servers/hard drives/printers, etc. Anything that plugs into the wall, or uses batteries, we accept. Our website url is [login to view URL] You don't need to include the "http://www." portion in your logo designs.