Do some port research on:
http://www.visitmyharbour.com/harbours/solent/
example Yarmouth:
http://www.visitmyharbour.com/harbours/solent/yarmouth/
Get an Almanac - Yachties replace them every year as they are all loaded! If you know any ask them for an old copy!
It will have all teh info you need for approach Harbour vhf channels ect..
Or try http://sailingalmanac.com/
Just check a chart before steaming in - you never know what might be under the water!
Enjoy,
Rob