simple answer, no! you do not, BUT (notice it is a big but) as has been said long rod + side rod/s can help enormously in keeping the dot floating slowly in the gold. Even without much weight they have been proved to aid stability/aiming, the BIG question is how much weight do you need and where to put it!
14oz out front and 20oz at the back is a lot of weight when you add it to the bare weight of the bow, and you have to be physically strong to shoot with that amount of weight.
Obviously, as a beginner you will not want to put on that much weight just yet. Get your form right, allow your muscles to build, then you can start adding more weight. BUT! where to put it? Most people would assume most weight goes to the front, but as you can see it is the opposite.
You have to ask yourself what you want the weights to do, for most archers for every ounce at the front you will want 2 or more at the back.
Why? well! the long rod is longer than a short rod (obvious I know).
For me, and believe me I am no expert, I want the bow to be "just" slightly forward of centre, I achieve that by altering the forward and or back weight, this means for me that i am not fighting to keep the pin in the gold in the vertical plane.
The position of the short rod in relation to how far the short rod weight is from the centre is also important. When I draw the bow up, I want the scope bubble to be in the centre without fighting it. It all makes the bow more comfortable to shoot.
Now what I have said is my take on stabilisation, but there are top shooters who have exactly the opposite view and prefer more weight up front with little to no weight at the back. Don't forget all bows (without anything added) balance differently and will need different weight distribution.
Do not forget, whatever you decide, you must be comfortable with your setup. You can change it as you get stronger and more confident in your setup. It does take time, I am fortunate that covid19 lockdown has been a boon for me as I have been able to play around with all sorts of combinations of weights and distribution by shooting in my (small) back garden.
Just remember, no one said it was easy! or did they?????