Source:http://zenhabits.net

1. Put their interests first, always. Do you enjoy drinking or smoking? Guess what — it’s not good for them, and you’re setting an example with everything you do. I quit smoking about 18 months ago not for my sake, but for my kids. Now, it is still important to take care of yourself (otherwise you can’t take care of them), but you should still have them in mind.
2. Protect them. As a dad, one of your main roles is protector. There are many ways you need to do this.Safety is one: child-proof your home, teach them good safety habits, set a good example by using your seatbelt, make sure they use a car seat if below a certain age & weight, etc. But financial protection is also important: have life insurance, car insurance, an emergency fund, a will.
3. Spend your spare time with them. When we get home from work, often we’re tired and just want to relax. But this is the only time we have with them during the weekdays, often, and you shouldn’t waste it. Take this time to find out about their day, lay on the couch with them. On weekends, devote as much time as possible to them. While work may be your passion, it won’t be long before they’re grown and no longer want to spend time with you. Take advantage of these years. The thing kids want most from their dads is their time.