If you are going to play video poker for the first time, try playing free variation for now. There are a bunch of free sites like wizardofoz or freeslots.com or just google it.
If you want to wager money I can recommend you Jack or better at 888casino which is my first choice casino not only for video poker. Of course, this is my opinion so feel free to pick the casino that suits you. Take a look at this article about video poker https://www.bestonlinecasinogames.com/video-poker/ so it will be easier for you to find a casino with good video poker games and free bonuses ...
Anyway if you decide to start playing keep in mind these basic tips
Match your hand to the highest initial card amount and know how many cards to hold and discard.
Don’t drop a low pair, even if you have three cards.
Always draw for a flush over a straight.