Microsoft CRM Webservices

I am trying to connect to our CRM Webservices. I know the XML request I can send and also the name of the webservice etc Problem is getting it to work!!There are two steps,firstly I need to get the crm token,which I then (2nd part) use as part of another webservice request to get the various entities and their attributes. Ive been trying this for over a week now and still no joy anyone got any ideas?!