Good Morning,
I have four different species of oak in my collection.
Read through the websites section on Oak
www.bonsaiempire.com/tree-species/oak, it provides the basics. Leaf reduction is said to be very difficult to non-existent. Therefore it is best to grow a fairly large tree 50 cm plus. Then the leaf size will be in relation with the size of the tree. The exact type of Oak you have also makes a difference. Are there any oaks in your neighbourhood, indigenous or otherwise? They are pretty tough little trees. Keep them out of direct wind, and keep them moist.
The best species to start with is with something from your neighborhood, or even garden. You will learn a lot and may even end up with a Bonsai.
All trees do best outside, Maples and Elms I am not sure if they will like it inside, but I have a few Ficus that have been growing inside under CFL lamps very successfully. Their growth is not as vigorous as outside, but very healthy and strong.
Good Luck and may you have a pleasant journey.