How to start a online business with low budget?

How to start a online business with low budget?

How to start a online business with low budget?.it is an online blogshop based in Singapore. the direction is to be like the brand AMENPAPA.com.

is there any way to promote the website on a low budget? (besides social media)
any way to source out manufacturer for womenswear and menswear?
any way to reach out to the target audience of 18-30 year old?
what is the more specified direction?
is there a way to test out if the design is sellable before manufacturing?

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