raised beds

i have raised veg beds, filled them with a good quality top soil initially, then incorporated compost in all but the bed i was going to grow root crops in.so you must decide what you wish to grow, but start with good soil.i had 2x1tonne bags of greded topsoil delivered , and then wheelbarrowed into beds until 2-3 inches from the top, this will compact down and leave about 5" .this is useful as it provides a wind break for new seedlings and will allow you to net across the whole bed, which you will need to do , as the local cat population will take a definate liking to the fresh top soil, and there is nothing worse than seeing a lovelly row of carrot seedlings dug up .
my raised beds are about 18" high bye the way.......steve

If it is available definately go with a commercial topsoil which you can add compost to, if not make up a soil mix of your own. I use 1 part peat moss,1 part coarse vermiculite and 1 part MIXED compost. Do not use just one type of compost, 3 is good 5 is better.