what musterion99 said, trying to be more like Jesus, and what it says in Romans 12. :D Also, not being materialistc, sexually immoral, etc. Basically live to please and glorify God, not living selfishly for yourself.
To love one another as God loved you first so, basically, what @musterion99 has said! Starting with that everything else deduces fairly naturally. If ever you are in doubt as to what your should do to be faithful to your Christianity, chose the most selfless, loving path and trust that God is leading you.
In agreement with musterion99@xanga, I would like to also point out that you cannot be "good" simply by avoiding sinful actions. It requires a proactive stance. I agree that it comes down to love, because God is love. But we must remember that "love" is a verb.
"Anyone, then, who knows the good he ought to do and doesn't do it, sins." James 4:17, NIV
1) KJV Bibles Only- everything else is watered down and tainted by Satan! 2)Tithe or you cheat God 3) Dresses & skirts 3 inches below the knee if your a girl, shirt & tie if your a guy 4) be at EVERY church service or have a written excuse, otherwise the elders will call on you! 5) don't sit in the last pew in the back- everyone knows that is "Back-slider's Alley" 6) If you go forward at the end of a service you better never sin that one again or next time you go up, you will be gossiped about 7) If someone asks you "If you died tonight, are you sure you'd go to Heaven?" You must be able to quote the entire Romans Road by heart, Chapters & Verses included!
Now for the Real answer: musterion99 got it right! and here is the scripture that it came from: Matthew 22: 36-40 :)