Welcome.
Juicing once a day is a great life practice, but what you need to do before starting anything is CLEANSE. This will set the baseline from what you will build your new self upon. You need to take out the garbage, tear down the walls and start fresh.
I HIGHLY suggest doing the first mental challenge of several to come.....either juice feast or water fast for two weeks. This is a HUGE part of starting off on the right foot so to speak. Your body and mind will take to the program much quicker and with zest when starting out on a clean slate.
I also suggest you immediately start doing the Wim Hof breathing method twice a day...once in the morning after rising, and later on in the afternoon. No need to buy the program unless you want the real specifics. There are plenty of places to get the information online for free not too mention learning all that this breathing exercise can do for you.
Start doing these things.....now.
We're all here to help and we have alot of smart, dedicated guys that know their shit and are getting results.
Also...ditch the multi vitamin and Vit. C. You should be getting all you need from fresh produce and herbs. Instead of the multi, use pine pollen from this list to get your vitamins in bio-avaiable form :
CD's Natural Testosterone boosting regimen