You won't be profitable mining Bitcoin in such a late stage. Sorry, you're too late to the party. You would have to invest thousands of dollars up front for high end equipment and you need very cheap power costs to become profitable. If you have thousands of dollars to invest, just buy and hold instead.
If you need a decent Bitcoin wallet, download Exodus. It is stored on your computer, but they have backup measures in place so you can recover if your computer becomes unusable. Personally, I have the Ledger nano S. This is a hardware wallet, which is way safer than storing it on a computer or any type of online wallet. If you can afford it, get a hardware wallet as soon as you can. Ledger nano s and Trezor are good ones.