New raised bed
It is not recommended to put tiles and stones in the bottom of a bed to improve drainage. You should begin by looking at our Vegetable website and 'Preparing the Soil'. You need to add sources of organic matter which include compost, well rotted manure, or leaf mold (composted leaves). Organic matter can be purchased in bulk or bags. You will have to look in your area for sources. D.http://extension.umd.edu/growit/food-gardening-101/step-3-prepare-your-soil
You can also call around to topsoil/mulch suppliers for commercially available mixtures of topsoil and leaf compost. This makes an excellent media for raised beds - blended topsoil (70%) and leaf compost (30%). Can be purchased by the cubic yard. Here is information on beginning your own home composting.hgic.umd.edu/content/documents/HG35BackyardComposting10_2010final_000.pdf
Whenever buying topsoil or organic matter it basically is 'buyer beware'. As far as compost, the only way to know exactly what you are putting in your veggie garden is to make it yourself.
See our videos on raised beds http://youtu.be/fB8W232p9-w,
http://youtu.be/TKE2Ya7k9-0 See our Profile on tomatoes for information on planting and spacing http://extension.umd.edu/growit/vegetable-profiles-tomatoes
Contact your extension for more information http://cce.cornell.edu/