how to create new bones?
thats all i want to now
This is not possible in unreal editor. It has limited ability to edit animations or even make some new ones but it cannot create. You need to get a 3d modeling software for this. The reason is because the bones move groups of vertex data. Unreal doesn’t have the ability to change vertex groups to add new bones and animate the model according to the new bone. Blender is free and there are a lot of resources to learn modeling and animation in blender so you can accomplish your goal.
Maya is also free for students but because of license agreements you cannot make money off of anything you make with Maya. Hope that helps you. Best wishes.