Get practical chess training now and play this position below with the white pieces. You enjoy a 5-Pawn-Advantage so you are expected to win this game.
Let's understand why you have an advantage in the chess position below as White. First let's look at the material as we always do and after that we look at other advantage factors.
If you add up all these material and positional advantages you get roughly a 5-Pawn-Advantage, which is very strong and we can say that this is a winning position for White and you should be able to win it.
Hint: Use what you have got! You control the b-file, so use it to penetrate into Blacks position (to the seventh rank). Trade pieces only if this improves your position, and for no other reason. To trade the queens now is not a good idea as you will lose a lot of advantage if you do that because Black recaptures with the knight and you are in trouble as it attacks your rook...
As the a-pawn is a passed pawn it strives to go ahead, but it can't do that as it is blocked by the black rook. So it would be a good idea in the long run to free this pawn to enable it to run and to promote into a queen.
I wish you the best. Good luck.