Sooner or later two cats find a common language and get on with each other. However to wait for that happy day of reconciliation when there passes the jealousy and mistrust, optional. Try to regain control over situation. If the first acquaintance of an adult cat and kitten takes place smoothly, you should not worry constantly for the newly arrived little pet.
Cats hardly give in to training. It does not mean that it is impossible to train them at all. Stock up with patience, and you teach the pet to various tricks. Only do not forget that cats are capricious therefore coercion will not lead to anything.