1.The game is easy to figure out. There are learning curves just like any game, but you will have no problem.
2.Which ever you want to do. I like position player myself, but I also do a pitcher. You can play the field and run the bases if you want. There are options for all of that.
3.It's not to hard to make the show, you just have to spend some time on it.
4.It's not buggy at all, someone will argue it is, but nothing bad. Trade logic is not very good, but what game is? Not sure what you mean by your teammates being zombies, but they play just fine.