You will find everything you need on this site with some of the best campsites and caravan parks in the country

http://www.forestholidays.co.uk/
http://www.forestholidays.co.uk/camping_and_caravanning/our_sites__locations/england-1/new_forest.aspx

Other:

http://www.newforest-online.co.uk/new-forest-campsites-caravan.asp

http://www.new-forest-national-park.com/new-forest-camping.html

http://www.forestry.gov.uk/forestry/infd-6a5l2s