How to be a great father ?

Be involved in your kids' lives. Play with them, teach them valuable things, spend general time with them where you can, and foremost be there for them. Make sure they know and understand that if they mess up, or if something is bothering them, they can go to you for help.

The bond you make between your children and yourself will be irreplaceable. Just for the love of god, don't abandon, ignore, or beat them.