как я иэмеяю существительное к/до прилагательное

Perhaps it spelled wrong about the headline but here is my question.

How shall i change words from substantiv to adjektiv.

I read many times and i guess all russians here also do that a lot of substantiv transform to adjectiv when you are suppose to describe the unit.

Like, зима-зимяя

That's all i know, if someone here can describe how to make a random substantiv to adjectiv with help of special rules or something it would be great.

I hope all here know what i'm talking about.

And btw sometimes you would see a adjectic who ends with -ческий , i guess that has to be when a word ending with letters like ч...ц...ж...к and so on.

There is no single easy set of rules to form adjectives from nouns. There is a number of suffixes used for that purpose, and they are often used inconsistently. You need to consult your dictionary in each case.