Hi Mick,Which end of the piece of string do you want to start? If it floats it can be modeled.
If I might suggest if you’ve no previous experience I would start with a kit. Below are links to some good companies.
http://www.georgeturnermodels.com
http://www.jotika-ltd.com/Pages/1024768/Ccraft_Front.htm
http://www.modelslipway.com
http://www.ripmax.com
http://www.graupner.de/en/home.html
The above will give you a huge choice from simple to complex, fast to slow. Most kits come complete except for motors, batteries and radio control gear. These can be obtained along with advise as to type, size etc from your local model shop.
Failing that there are some specialist shops for mail order. The two listed below I can recomend.
http://www.westbourne-model.co.uk
http://www.scoonie-hobbies.co.uk/
They will also be able to give you advise as to suitability of your intended model.
Then there are the forums – ideal for getting advise/suggestions. There is no such thing as a stupid question, we all started at the beginging.
Hope the above will be of some help. Enjoy your voyage.
Regards Kevin