New to the scene. advice needed

Hello all and specially Mrgrowit,

I am new and been doing some research for sometime, however the net is good because you get a lot of information but bad because you read millions of ideas that gets more complicated the decision. So I am thinking in starting 4x4:

Spiderfarmer SF4000 - for the price range of $500 do you think I would be better with something else ? Do you have discount code as like the past that works on their European page ?

Intake fan - Ac infinity t6 - quite expensive but I really want the low db. This is your advise ? Any other that you think should be considered ?

For the Fans how many it is needed I see people with 1 others with 4, still don’t know. Do you advise a specific brand that are very quiet ?

Nutrients - I am thinking going with a three pack from a brand bio bizz or similiar, calmag. Is there something more that is really needed ?

Regarding the AC infinity and the normal fans should they all be working 24/7, only when lights are on? or what is the time, still don’t get it:(

Last question and sorry all of this. Do you think for first time I ahould do any training or just let them grow as you showed on your last video ? If train what do you advise ? Scrog + topping ?

Thank you so much and sorry for wall of text.