Laura,
Well mixing both 50:50 would really be the absolute best. I understand not wanting to drive an hour with manure in the back.
So if composted wood is what you have, let’s start there. I would not turn down this free material. If I had an abundance of composted wood, I would want to make raised beds and fill with the aged wood. To get some fertility going I would plant some legumes to pump in nitrogen. Further, I would want to get some fungi growing such as wine caps or oyster
mushrooms, though given how degraded the wood already is, I don’t know if those would take off.
Ultimately I would try to make the wood into soil by adding in the biological components of soil, many of which are certainly already present.
If you have more specific questions, fire away!
Eric