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John Hughes
Depends what you're building but usually as follows: Primer, paint(s), gloss coat, decals, gloss coat (to seal decals), then weathering products and finally a matt coat to seal the lot.

Steven Van Dyck
First remark, Tamiya paint is meant for an airbrush. Some colors can also be applied with a brush, but they dry very fast. In that case you wouldn't need to prepare the model with a primer either. I use the primer mostly because the model has building materials with different colors. Only if painting is done and decals are applied over a gloss varnish (if paint wasn't glossy), and with a gloss seal over them, should you use any wash. I mostly use colored wash. Try to remove most of it and only leave it in the panel lines. At last use a dull coat.

Kesa Tiho
Im building a german 75mm anti tank gun and japanese type 97

Kesa Tiho
Well from my experience tamiya paint can be used with a brush very well

Ben M
I think we all come up with processes that work for us. For armor models I normally prime, do preshading, color coat with acrylic, weather with cheap artists oils and pencils/pastels and then a final spray of "dust" with acrylic. Example here: Disston Tractor Tank | Album by uhrwerk (1:35)

Kesa Tiho
Thats helpful

Kesa Tiho
Thanks

John Hughes
YouTube is your friend for modelling videos too. There are many channel devoted to plastic modelling. Some of the one's I watch regularly are

Nigel's Modelling Bench (does a beginners series)

Jeff Donahue Scale Modeling

The Model Shed

Yorkshireman Models

Nostalgic Plastic

There are loads of them.

gorby
As Steven says, Tamiya acrylic paint is intend o be used in airbrushes. If that is the paint you have, the best way to brush paint it is by adding a few drops of Tamiya Paint Retarder. I know that product isn't widely available so alternately, and brand of acrylic paint retarder should work. Again if that's not something you can get your hands on try adding a little bit of Tamiya Thinners (Isopropyl Alcohol is a cheaper alternative. As it's alcohol you might need an adult to buy it for you. Most importantly, don't drink it, it isn't that sort of alcohol).
I haven't tried it personally, there is a way to mix your own paint retarder – quoting form the internet:
most acrylic retarders are just glycerin, glycerin is cheap at the chemist/pharmacy. It has a syrupy consistency so put about 125ml it in a 500ml distilled water then add about 5 drops of washing-up liquid.

Unfortunately model paints aren't as straight forward as just painting from the jar.

Kesa Tiho
I dont use tamiya acrylic i use just plain tamiya paint with no other labels on it

gorby
Plain Tamiya paint is acrylic. 😉
Somewhere on the jar it should say what it is. If it's 'X' or 'XF' then it's acrylic, if it's 'LP' then it's lacquer. I haven't used lacquer paint so I don't know how to use that.
Like I said, model paints aren't straightforward. 😄