All that is required to grow most plants is seeds, soil, water, sun, and time. Finding the right combination of these ingredients can be the tricky part. Rosemary, on the other hand, has a reputation for being temperamental. But, since I once got 70-plus little plants from one packet of seed, I think her perverseness has been exaggerated.
Several companies sell sample size packages of herb seeds.
These smaller packets provide an adequate amount for most gardeners. It is possible to start seeds in regular potting soil. Chives, oregano, sage, and thyme are all perennials, while caraway and parsley are biennials. Basil and dill are annuals and rosemary is a tender perennial, which means that, here in PA, I have to treat it as an annual. Since rosemary is a slow grower, however, you might want to start it with the perennials.