I am planning on staring my wine kit next week (yay!)

I am having a bit of confusion about cleaning and sanitizing. My kit
came with

straight a cleaner and one step sanitizer

some instructions say to start by cleaning everything at once, others
say clean and sanitize parts to be used at each step, which to do?
Should i clean the bottles at the same time, they'll be sitting as
much as a month(or longer if bulk aged) or at the time of bottling.

one step says it will only be good for a week, do i have to make a new
batch every time i do SG test for the hydrometer, sampler, and test
stand?

one step says rinsing it not neccessary, will it hurt to rinse?

also, mixing instructions are for a gallon of each, will i need that
much? more? less?