Here we go... first, your guy is walking... perhaps you could go with a dirt and gravel roadway... in a large scale such as 1:16, I'd recommend this step by step guide. I will assume the soldier is already built, detailed, and painted fully.
1) rough up the top of your wooden base, to allow for better adhesion.
2) put a white glue (100%!!!) coating on the base
3) sprinkle on HYDROCAL.. sold in any train hobbyshopd... makes fine, crack-free " dirt". While still wet, place the soldiers feet into the mix so that when we are done, he will have some "weight" into the ground itself.
4) After this drys, paint is a dark earth (coffee?) color and let dry.
5) Come back and dry-brush on a lighter shade of brown for highlights (tan)
6) Allow this to dry thouroughly... say 24 hours.
7) come back and sprinkle on clay Cat Litter (NOT the clumping kind!!!!). This will be larger "clods" of dirt, or perhaps rock. Don't TOTALLY cover the earth you made... about 70% coverage will work fine.
8) SPRAY on a mist of 1:1 diluted white glue and water. Soak the sucker! Let dry for 48 hrs.
9) Come back and highlight with a light gray, or a terra cotta brownish orange.
10) Soak an old house brush (light color bristles) in a green diluted paint overnight.
11) Take out the brush, and let it dry. Should be stained a "weed green" with some brown.
12) Hold clumps of bristle and clip of various lengths. Glue into the "side of the road" to have some weed growth. Line the roadway this way, on one side only. (FAR side, not Near)
13) Once the "weeds" have cured in the glue, come back and dry-brush the tips yellow or lavender.... just here and there... this will show some Autumn flowering
14) Place your soldier on the base... drill a hole in one foot, and insert a brass rod. Drill a matching hole into the base itself, and insert the other end of the brass rod, with a little CA glue.
15) go out and win first prize at your next contest!