Becky,
An additional note- while our pasture land has *greatly* improved from when we bought the place, it is in no way as excellent and improved as our gardens- by any stretch. But, it doesn't have to be, either
Improving pasture land is different than improving gardening areas, which is also a bit different than improving lawn area.
The first step is figuring out what you have (or don't have), what your goals are, what you can do with the resources available to you(working with nature- no monocultures) and go from there.