Easyriders suggestion above is what I would go for, it'll last you for a good while but....if budget really is a concern you could get a super cheap behringer interface and an sm57. If you're completely new to it and want to experiment you could save some money for now but will want to upgrade in future.
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He certainly won’t need to upgrade for sound quality only if he wants more inputs...I increased my IO to ten on my ID22 by connecting an Audient ASP 880 mic pre over ADAT so I could record live drums...