Do your research, find out what the best online dating services are and find out as much as you can about them. You can find out details like this by asking friends and family who have used the services, asking on internet forums, searching google, reading articles, there are many ways you can find out what you need to know about a website, all you have to do is search for it and ask others.
Be honest with people. One of the best qualities someone can have is honesty, be honest in everything you say in the online dating communities with both the service and other members, if you wish to form long term, strong relationships with people then it would be a very bad idea to lie to them, I’m sure you would not want them to do it to you. If you ever do not want to answer a question or give out some details, just let the other person know that you feel uncomfortable, this is a much better option than lying. Be pleasant with other members. Everyone is in these communities for a reason, they want to meet nice people they can talk with and maybe build a relationship with, they do not want to take part in the community in which they have to deal with someone being very unpleasant with them and making comments that are uncalled for, be nice to people, even if they do not deserve it.