I have one called Electrum, and one called Mycelium
Neither has anything in it.
They are both on my phone.
Electrum is also on my computer.
Electrum has very detailed (perhaps too detailed) documentation
Only Electrum has anything in it, and that is just the amount I put there as a test.
There are two ways I have that I could I put the money into the wallet.
One is Coinsmart
The other is Coinbase which is what I thought I used, but apparently not.
Of the two, Coinsmart has the more usable help.
Both Coinbase and Coinsmart allow you to deposit money to them, similar to the way you fund a poker site.
There are transaction fees (of course) -- for example, if you upload $ using a credit card, there is a 6% fee
Using Interac the fee is waived for transfers of more than $2000
Once the $ are there, you can withdraw them to your wallet.
I presume that you can also send them to crypto-enabled poker sites also -- but I haven't done this yet.
From the Electrum wallet, there is a "send" function that you use to send the btc to an address provided by the poker room.
There is a new address for each transaction.
Hope that helped