http://www.scottish.parliament.uk/EducationandCommunityPartnershipsresources/Special_Delivery_Timeline.pdf
This provides a basic timeline of the major events from the death of Alexander III to the execution of William Wallace, including the known events of Wallace's life and some useful, reliable references. It does not pretent to be 'new' information but is a useful starting point if you wish to learn more.
If you have other links to reliable information, why not post them here as comments?
The timeline has been developed in association with the forthcoming exhibition on the Wallace Letters, organised by National Records of Scotland and to be held in the parliament between 10th and 31st Aug 2012
http://www.scottish.parliament.uk/visitandlearn/45948.aspx