I have so many Android App ideas but am afraid to develop them from the fear that no one will find them because I don't know anything about app marketing. Anyone been at a similar point and has some tips where to start?

Listening on port 3000.

Start with Android entusiasts. If you follow Googles Guidline on design and UX, they will appreciate.

Be active on forums, blogs, pages about Android. If you think that app is good, start with beta in Play Store, so people can help you make it very good. Send it to AndroidPolice and so, they may write about it if it as any good.

thanks for the tips @afrometal