How do you know what paint to use on my model

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My caregiver and I went to Walmart today and I bought these brushes.

EDIT:: they cost me $9.88 total with tax.

 

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DOH! I thought the brush kit had brushes in it that it doesn't have. I thought it had a fan brush but it does not. I can't see wanting more brushes... I can see getting some higher quality brushes. (Some were damaged in shipping.)

 

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Chinook Display

 

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It looks like I need to thin the paint somehow according to a video I just watched. How do I know how much to thin it? I'm using Acrylic and Lacquer paints.