People have answered already but we were all beginners at some point so I will give a few good tips .
Research and education. This is the key thing. In 100 grows you will still learn stuff. This is paramount. For example you talk of training and multiple toppings. You have a 60x60 tent.
Google plant anatomy and training techniques.
Feeding. Get nutrients and the correct ones. Google cannabis plant nutrition.
Environment needs to be right. Google. In fact Google growing cannabis and READ IT.
Label and record daily data. What to record will come after reading.
Grow in Coco and perlite with Coco nutrients.
Get a light equal to30watts per square foot of grow space.
Main thing tho is knowledge. You will kick yourself when you realise a bit of effort and reading could have saved you tonnes of time and cash.
ONLY DO SOMETHING TO YOUR PLANT IF YOU KNOW WHAT TO DO AND WHAT OT WILL DO OTHERWISE JUST DON'T.
I CRINGE AT SOME STUFF I USED TO DO.
READ AND WITHIN A YEAR YOU WILL BE GOOD ENOUGH FOR A SUCCESSFUL GROW. HOW SUCCESSFUL DEPENDS ON THE AMOUNT OF LEARNING YOU DID. EVERY SPARE MINUTE, READ