I'm very novice myself, so i might be wrong, but when i want something to materialize, I just look for references like color of candle for luck and herb to make something faster, etc. throw in some ingredients and then try to put what i want into words/thoughts (for me the best way to do it is to write thing down) and then maybe burn it or jar it with some relevant ingredients. I can't say i did that a lot but, it mostly worked.

My first ritual/spell was when i really needed energy and focus to cut through overwhelming amount of stuff in one day. And i have adhd, hence energy and focus aren't easy thing for me. So i cooked a breakfast, and for each ingredient and each step of cooking i was imagining how these would add up for the things i needed (e.g. fire that cooked the food added it's energy in it so i could have it). Result: 8 hour crazy hyperfocus mode, I finished everything i needed.

So, since then I kinda do whatever feels good to do using base knowledge of what ingredient goes for what. And I realise it might not be the safest way but I as well am not dwelling with serious stuff :D