As a long time Splinterlands player...welcome to the game.
Unfortunately I have to tell you that while it is an excellent dApp and you can learn an unreal amount about the power and possibility of blockchain by playing it (Soulbound cards, renting cards, buy/sell, voucher coins and so so much more) the money you make is small compared to the time commitment.
If you are free to play you'll want to start in Foundations league (I was calling it Frontier for a while..oops). 5 wins gets you a card worth about a penny. Maybe more if you get a good rare or legendary but still... half an hour for a penny is a pretty poor return on your day ... especially if you are a busy business owner.
Still, I would absolutely recommend you play to see just what cool things you can do with the blockchain.
Also, guilds/Splinterlands community is what got me into Hive and the reason I've stayed for over 5 years. If not for them I would have bailed long ago.
Wow, I checked it out and still doing my research on it. I can't wait to get started.
If you have any questions let me know. As a veteran player I might be a useful resource :)