There are some good tips here: http://www.wikihow.com/Make-Friends
I have found that most of the time, you will need to be the one to reach out and make an effort.
Be on the welcoming committee when someone new arrives in the neighborhood or in your work office. Welcome them with a little something.... maybe a homemade treat, donut, etc. something thoughtful...maybe just bring a coffee to their desk a few times and small talk.
Most people like to be around others who are fun to be around. If you come off as emotionally needy that is usually a turn off. Everyone has their own problems.
Learning to make small talk is important so you can get some ideas of this persons views (positive or negative) to determine if this is someone you even want to be around. After all, friendship is an investment of your time. You will need to determine if there is any common bonds or interests.
Until you know someone really well, I would keep off the topics of religion, politics, and sex. And certainly I would not begin with hello I am a former Jehovahs-witness. Not many people will know how to deal with JW much less ex-JW. Save it for later if you get to know them well.
I really feel bad for those of you who are friendless, and I often see this with other JWs. So I can't help but think this is a particular enigma to the religion.
I have thought it so because all your time is taken up with meetings, door knocking. There's no time left for social events. In that rigid schedule you have no time for anything else.
And besides, most social events like parties and occassions are scorned by the religion. And if you were to join a club of interest, I am sure others from the congo would put you down for it....wasting your time, blah blah blah. Just as with education or anything else you do to improve yourself.
Not to mention, too, having such fear of "wordly" people drilled into your fabric for so long makes it scary to approach anyone outside your cult circle. And the Friends you find within are only conditional.