First, love yourself:
To find love and happiness elsewhere in the world, you must be at peace with who you are. Do not reject yourself or withhold self-acceptance because of perceived imperfections. Accept yourself as you are, and out of love and respect for yourself you may seek improvement. See yourself as worthy of love, because you are.
Second, love your family:
Accept the mortal nature of your family, by blood or choice. They, as you, are prone to mistakes and faults. They, as you, are worthy of love. Respect them as yourself. This extends to your parents, elder or younger relatives, friends, as well as your partner. Help them to grow as individuals, while remembering their individuality: they must walk their own path in life. Accept imperfections as what makes them unique, and forgive their mistakes and faults made in error.
Third, love your neighbor:
The people around you have their own trials and troubles which they endure, just as you. They come from different backgrounds, different families, and bear different perspectives by default. Their impact on your life may be great or small, and likewise may you impact their lives. Accept their mortal nature, and recognize that their path in life is no less important or valid than your own, despite any differences. Offer them the same compassionate acceptance and respect that you would wish for them to show you. That which is objectionable to you, do not impose upon them. See them as equals, because they are.
Fourth, love your enemy:
Just as your neighbor, your enemy has had their own experiences, and their path in life has lead them to a place in opposition to your own. This does not make their path invalid, for we are all products of our past. You have not endured their history, as they have not endured yours. Recognize that pain inflicted is often pain felt, and thus may you understand their sorrow and suffering. Offer them compassion as you would to a neighbor. Do not pursue aggression or conflict, but do not suffer it when it is offered to you: to defend what you love is itself an act of love. Do not rejoice in their defeat, but grieve that the conflict became necessary.
Fifth, love the world:
Every being in the world is a product of past experience. We each have our own path to walk and, while paths which respect the happiness of others are ideal, no path is less valid than another. Love the world as you love yourself: accept what you cannot change, and seek improvement out of compassion, not hatred. Recognize that you are part of the world, as all are, and are therefore connected to all regardless of distance or other barriers. Recognize that through service to others you serve yourself, as well as those you love. Feel the joys and pains of the world as your own, because they are.
When in doubt, return to the center.
When in doubt, return to the center.