But if your company does not know about bitcoin, the only way you can do it is still receive your salary in fiat money and then you can buy bitcoin through exchanges or another way by depositing the money from your bank.
You need to know how many total expenses are monthly to know how much money is left in your wallet.
After that, you will know how much money you can use to invest in bitcoin.
You can pay off bills using the way you already used because that will not prevent you from investing in bitcoin.