SPM quick start
Quick start? Hahaha.
No, seriously - we may be able imagine something like that in due course.
For now, please see this nice document: http://ftp.fil.ion.ucl.ac.uk/spm/doc/QuickStart.doc
There are very useful [http://www.fil.ion.ucl.ac.uk/spm/data/ practice data sets at the SPM site] to start learning SPM. You could try following the [http://www.fil.ion.ucl.ac.uk/spm/course/usa/Lab-Book.pdf SPM course lab book] practical excercises to get a feel for SPM.
Of course, see also the SpmManuals, which include step-by-step guides to analyses.