I think its great that you are taking an interest in smallholding. Many young people are turning to other work, and moving to cities to earn more money.
Can I suggest that perhaps you go to college or something, and do a course. Then you Mum will see you are serious about what you want to do, and of course you will get qualifications and have more knowledge to keep animals etc.
I have an interest in bees, as my uncle used to keep them here at the farm, but I do not have any yet.
Just one thing, if the land has tenant farmers on, if its long term, I do not think you can ask them to move off the land until they want to? We let ours on a yearly licence, so thats different and the farmer has not got long term rights to stay.