you can go 24/0, 18/6, and 12/12
a lot of people push 24/0 which works well... I like 18/6 myself because im growing in a small area and like that theres cool down time
also theres a big group of people who are starting 12/12 from seed and having amazing results for plants in small areas... like if you only have 2-3 feet of height you might want to consider it
start a journal and people can help you out, later man
also you flower when youre 1/3 from the total height you want... other people say differently but i find that works