In reply to PT:
You could try the BMG web page (bmg.org.uk) and look for a fully qualified guide who works in the Alps in summer (aspirants have to be supervised by a full guide). However, as Ian says, most will be fully booked by now. Guides may also charge you for travelling to your location, food and any overnight accommodation, tho they do get accommodation free at CAF huts and discounts on cable cars etc).
If you want some walks to do and you are going to the Chamonix valley there are local walking maps you could buy (I bought mine for about £2 at the campsite) which grade the difficulties of the paths in the area, or you could look around the bookshops here for more comprehensive walking guides. If you don't have glacier skills then you should stay below the snow-line or go with a guide or with a friend who's experienced.
Depending on your age the Conville 3-day alpine courses for young people may be suitable for you - and a lot cheaper - but dates and availability are not guaranteed. Have a look on the BMC website.
Good Luck!
Liz