I believe the visa that you are referring to is the Working Holiday Visa. Speaking on the Australian one:
1) How long am I allowed to stay in Australia, how long will my visa allows me to stay?
1year from the date of your first entry into Australia.

2) How much do I have to pay for said visa?
The visa application fee itself is RM1200. In order to get the supporting documents, you'll need to fork out around RM50 to get your documents certified, certificate of good conduct RM20, proof of English (either get your college/university to say that you have completed your degree in English) or pay RM600 to sit for IELTS.

3) How much do I normally get?
not sure.

4) Is accommodation, transport and food supplied by the farm owner?
not sure.

5) What are the qualifications to work in this field?
Have perfectly working limbs ?

6) How many hours exactly can I work for a day and a week?
not sure.

7) Where should I apply this job?
not sure.

8) At which month can I start working?
not sure.