Needed help my fist grow Purple jems

ok just say im new and a big hello toeveryone, and this be my fist time growning iv got some ide how it works,my set up is grow tent with a 400w hsp im going to start my fist grow with lowryden Purple jems,and im going to do this Organic as it only takes 8 weeks to grow iv read lots so got some good ides i be doing 18/6 ones i ID the girls,what im get so confuss about is the feeding times what well be the best feed, iv got BioBizz Bio-Grow + Top-Max,As this is an Auto flowering,do i use the veg bio to start of for 2 weeks and stop and use the other 2 after till it fished flowering or should i buy the foxfarm big bloom ? and use this till the end of flowering iv got the ide on the mixing the water with this one 1/4 strength,and do i keep that strength all the time till the end ?
like i say im new and wet behind the ears ,any comment we be welcome but keep it smple,
thanks

In my opinion it's always a good idea to give veg nutes early in flowering, as they are going to still be growing, than switch later to the flowering nutes. I'm not very learned on auto flowering, so that part I can't help.

ok thanks i going to give it veg nutes,till i see me girl pop out,and then i well go 18/6 just need to no what the best nuts for flower them.