Lime can be found at most any garden store, and you can find an inexpensive soil test also. It will give you the basics and that is good for a starter. PH and other basics. They are not very expensive. Another thing, is this in the shade? Make sure you consider what type of plants you are putting where. Some do better in part/full shade, and others do not tolerate it well.
If there are trees casting dappled shade, check for root encroachment. Roots will spread beyond the tree canopy, and you will forever be fighting the hair roots that will take over your garden soil and rob all nutrients and water.
At my Sister-in-laws house, the hosta's did replace most of the moss. She replaced some of the soil in the problem bed and placed hostas and they haven't been overcome by moss - yet. She laid a thick layer of bark mulch and removes as much of the pine needles as possible as they fall every year.
Personally, I enjoy the variegated ones.....but you can mix them. Mine are lighter green and lovely white stripes. Little purple flowers on tall stems.
Hostas enjoy a water-retentive, fertile soil. Very heavy clay and sandy soils should be improved by digging in plenty of well-rotted organic matter. Ideally the pH of the soil should be 6.5 but they're still worth growing in acid or alkaline soils.