My advice to you (and generally the advice I give to everyone) is that you begin by choosing a few apps/sites and build a very basic profile that doesn't give away much if any information about yourself. Do this simply to start looking around, get a sense of how others present themselves and what they write on their profiles, who's available in your area, etc. Depending on where you are, some apps/sites may be more popular than others. You can set age boundaries on all of them. That can be your first step.
On some of the sites/apps (Match maybe?), you may even be able to browse first without making a profile at all.
Then, when you're *really* ready to start engaging with people, you can put effort into writing up your profile, putting your pictures up, etc. There are certainly tips about how to do a good job of that as well.
The big ones are Match, Tinder, Bumble, OkCupid (though that one seems to have gotten worse lately), Hinge, POF, eHarmony, Zoosk, and maybe some others. I'd say the BIG 4 right now are Match, Tinder, Bumble, and Hinge. My opinion.
There people looking for meaningful relationships and people just looking for sex on every app. Give it some time and you'll find you have both good and bad luck with all of them.
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That's just basic info. You can get tips here on how to build a great profile and things to watch out for as well!
[This message edited by Okokok at 9:40 AM, August 3rd (Monday)]