The first page of this
https://www.roleplayerguild.com/topics/184248-why-is-no-one-joining-my-rp-general-advice-thread/ooc
Has some good advice if you find getting started hard.

Eventually I'll add to it and post it as a guide.

You might also consider joining the Discord.  It's got a section for advertising new RPs and another for talking about ones you want to start, IIRC.

In general it will likely be easier for you to start out by joining someone else's RP than by starting a new one, so I'd suggest looking into Free or looking into Casual/Advanced Interest Checks to find something you want to participate in.

Chuuya is running a Christmas themed RP called Winter Tales that is just getting started.
https://www.roleplayerguild.com/topics/184299-winter-tales/ooc

There is also a RPG Writer's Club that Ambra has just started 
https://www.roleplayerguild.com/topics/184260-the-official-rpg-writers-club/ooc

Finally if you are a highly cultured man or woman of extremely high IQ and large of pp, Blackmist has started a King of the Hill based RP in the Free section 
https://www.roleplayerguild.com/topics/184286-king-of-the-hill-mountain-dew-electric-boogaloo/ic