Lots of people try to launch a business or collection with a huge range of products. They then find they don't have enough funds to manufacture everything they set out to.

They make expensive mistakes and their initial vision may never come to fruition.

Or they try to find cheaper manufacturers in order to squeeze everything into their budget to buy a huge amount of stock

You don't need a perfect collection, or a cheaper manufacturer, what you need is to start small and test your idea first.