You want to be a bit careful with expecting others to ‘prepare you’ for anything. Also a philosophy of ‘there is only so much I can do with my spare time’ wont really advance or aid you. You are already 20k down the tubes and I only see one picture in your gallery.
Designing and building functional characters takes a lot of practice and there is a big amount of technique tied to that work. There is much competition because it is a small market and really talented artists produce great work in a short time. Very motivated students stand a chance of finding employment. Unless you are very well connected if your folio sucks you are going to find it very tough indeed.