Decided to get into Warhammer and get a starter set please give me

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So my first painting project, will be to paint a Mantua 4-4-2 and a bobber caboose to resemble Tootle and Katy respectively! Any advice for a first timer? Pics for context.

I think I might have made a stupid purchase decision on instead of buying the recruit starter box. Could you help me please? : r/Warhammer40k

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