Slots and video poker on mobile devices

Hi im a programer and game developer from brasil i love cassino like games and i have my first slot made and ready to go
i need advice because now that i finally have the thing done im not sure if its legal for me to publish it in the app store and google play
its a original game but like most slots it contain virtual reels, scatter symbols, bonus games etc... all the good stuff
im a one man operation and did all the code and art by myself
does my product occur in any risk of being sued by big slot manufacturers ?
do i have to pay license to someone to use things like virtual reels for example?
and finally can i add other classic cassino games to my product like jacks or better video poker, bingo, roulette, baccarat?
are this games public domain or are they owned by some entity?
hope that someone can cast a light on that subject and that you guys forgive me for my bad english
ty