Hi paul
starts in stretford (about 3 miles out of the centre of town), passes man utds ground at about the half way mark it is quite a nice area called dunham massey a little rural. ends back at the start in longford park .
It is supposed to be one of the flattest courses in the world,and good for beginners and pb,s
There is a great website that gives all the info,map of the course,training plans etc the website is-
www.greatermanchestermarathon.com
You might be better booking a hotel soon as manchester gets very busy at the weekends and i think the marathon will attract 8-10K
Good Luck