According to your last thread you are teaching yourself how to do acrylics.
The answer therefore is still the same. Research a good system (a full system not just powders) and book their training.
Good brands are CND, EzFlow, Young Nails, Entity, Crystal and all have excellent training.
As you profile has no information I do not know what country you are therwfore what training and Insurances you require by law.