It depends on how many plants you plan on putting in and how much room you have but in the broccoli case you could allocate enough room for all the plants, buy a punnet (usually 6-8 plants) and plant them, leaving room for the rest later. Then a month later (more or less, not an exact science) plant another punnet out next to the first batch and then again a month after that. If you plant your first punnet at the very start of the season and the weather is kind you should have a longer season and broccoli ready for harvest in a staggered fashion.

Hope that helps. Can be done with other veg as well.

😂😉💚

Compost is gold... erm bitcoi... eh... compost is great. Each plant needs a bit different fertilizers, but compost is almost universal. Some plants don't like too much of it (like parsley) but not many. You can plant zuccini or tomatos directly into pure compost and it works great.

Some use commercial fertilizers to add since the blooming starts. But you can add a bit more compost instead... like every two weeks? Bird, cow, horse poop is the most typical, just make sure your plant likes it. You can buy it in a concentrated form too.

I'm an amateur, so watch some videos and read article or two about growing what you grow.

It also depends on how fertile is your soil, that differs a lot.

Also it sometimes takes about one season to insects/fungi etc to adapt to what you're growing, so the first season can be great and the the next one maybe less so.