If you are completely new then your best option (IMHO) is to use free online tools provided by Adobe. I suggest login using your Adobe D at this link:
You get photoshop express but it is identical to PSE10 and/or PS CS6. You can learn using the online tutorials and these are all given in the above link.
Hi to mytaxsite.co.uk - I looked at this site but it appears to only allow editing of photos but not mixing different ones. But thanks anyway.
Hi to Mark Sand - that is very kind of you and I really appreciate it. Its for a retirement 'do' so I have 2 themes - one put the face of the lady of the moment onto photos showing different work uniforms over the years and then three other photos, one superimposing Mary's face and the other two imposing George Clooney's if I can get one
Is that ok?