setting up osrm-backend questions

I have a need for processing bulk load of GPS data to distance travel. Has I understand it, I have to install

https://github.com/Project-OSRM/osrm-backend/

question: 1.) is the map data information included in the application or I have to download the map data separately, if so please point me to the url where can I download the map.

2.) I have read on some post you can import a third party map, an url to the instruction would be great

3.) I have bunch of gsp point data for a car travel during time periods and need to compute the distance travel, what is the best api to call for batch processing it?

4.) What do we need to put on our site to give credit to the project https://github.com/Project-OSRM/osrm-backend/