אהלן ! אשמח למידע על התנדבות באירופה.

hello, what you are talking about is called ``wwoof``. the wwoofing terms changes between farms. normaly its 4-5 hours a day, 5 days a week.
the best info would be form www.wwoof.com
it gives u the list of the countries u can wwoof in. you should first decide about the country you want to go to, then register and then start looking for a farm once u get the list.
its possible to combine both you have weekends for trips around the area you will be in and you can wwoof for part of the time and travel in the other part.
U should be more then 18