Just to clarify. If we go by the historical classification, we have the following declension classes for strong nouns:

Masculine: A-, wa-, ia-, ja-, i- and u-stems plus a few relics of consonant stems.

Feminine: Ō-, wō-, jō, iō- and i-stems plus a few irregularities, leftovers from the consonant classes and the word hönd which is the sole feminine survivor of the u-class..

Neutral: A-, wa-, ia-, and ja-stems plus the relic fé (u-class).

Those are all declension classes. The weak nouns then have a system of their own.

I hope this answered the question. Regarding the article, when and how it is suffixed is another chapter. All the best