I would like to set up an OSM routing server on my LAMP stack. I am interested in doing a lot of of routing queries. I have a search function that is closely related to getting the driving distance between lat/long locations and will thus be handling a lot of routing queries, even in a development environment. I know how to use the Mapquest API but would like to set up an OSM routing server before I sign up for a business licence with a proprietary mapping service. Where would I start this project? I have looked at OSRM and osm4routing but am still a bit bewildered and can't find anything very well documented out there.