Hello

So I'm new to Rohan, or more like new as of right now. I played this game long time ago, years ago. Now recently I came back. I really got myself into this game. Because of that I have some questions:

What will happen if I reach level over 50 without doing my job quest for another character class?? Am I loosing anything??? Does second class give you more skills point or stats points?? Can I just pass level 50 and do job quest without loosing anything??

Thank you for help