Contacting suppliers as a startup?

Hello everyone, hope yall are enjoying the break in the hot weather.

I'm starting an e-commerce business and was wondering how to contact suppliers. I watched a video a while ago and remember the guy saying something about the need to seem established already. In y'alls experiences, is this true? I haven't set up my shopify store yet because I don't want that 2 week trial to tick down quite yet (my logo isn't finished and etc)

Should I approach in a "hi, I'm the head of sales at x company and we were looking to scale up… website under reconstruction…." or can I be straightforward and just say "hi, I'm starting company x and am looking for samples"?

I'm really not sure if this will work out well for me but I believe I have a market, I just need to get a finalized product.