Welcome to the forum. We have a lot of good resources here and a lot of good people so enjoy your stay.
You can ask questions here: http://www.fantasicaunofficial.com/t95-got-questions-ask-here
You can find allies here: http://www.fantasicaunofficial.com/t472-looking-for-allies-thread
5*s or even 6*s are not needed to do well in events. Especially the tower events do not greatly favor those with powerful units or a lot of money.