Hi there i am able to answer part of your question regarding the make up of the force and to would advise you to vist it this page i have found on the nato website:
http://www.nato.int/docu/pr/2006/p06-096e.htm
I am not sure as to the number of aircraft out there as a whole as it is somewhat misleading to just give UK aircraft details. This is a NATO mission and therefore UK commanders will be able to draw upon a wide variety of airbourne assests. But in terms of attack options the UK assets consist of 6 appache gunships and 6 harrier GR9 ground attack aircraft.
I am led to believe that american troops do operate in the country but just not in Helmand province which is currently under British command (therefore getting more media coverage).
The overall NATO force comprises of over 18,500 personnel but i doubt all these will be based in Helmand province. It is most likley that UK troops will operate with those from the neatherland, Belgium, Australia, and Canada.
Primarly these troops will have in common the same level of high trainning and also there will be an amount of ease to operating with these countries as the UK forces reguarly train with them. Furthermore 42 and 45 commando units of the royal marines will be deploying to afganistan soon and they have trianed extensivly with many other NATO forces.
Your comment regarding the use of air power to "wipe out the drugs"....well whilst i do believe you are not wanting us to carpet bomb them i would have to say that even using persision guided missiles will often not always do the job.
In addition usign air assets too much dies tend to alienate the local population and there is in the end no substitute for having troops on the ground to mix with the locals and really use their eyes so clear identification can be mad