Word-Request – Expression for Doing Something Right Before You Need It

Your original sentence is unclear to this extent: Do you mean that each spice should be put in separately (one spice at a time) or that they should all be mixed together into something like a curry powder and then added in equal fractional parts?

I'll assume the former (it's more rational for cooking for a couple of reasons).

You can say it this way:

Rather than adding all (of) the spices at the same time while cooking something, put them in one at a time at regular intervals, for example, every 2 minutes.

You can also say:

... put them in (separately) step by step, ..."

There's no need to clutter the sentence with unnecessary terms like "rounds" and "steps".

You are still in the early stages of learning to write and you know there is plenty of room to grow and become better, but you still love to write. Your heading asked a general question, presumably covering a wide range of activities, not just writing.

Everyone is in that situation with respect to some aspect of their life - they are called amateurs.

I love to play tennis and hope to get better - I'm an amateur. My wife loves to cook and continually gets better - she is an amateur.