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Squarespace Template or Design Kit
You should go with: A Pre-Made Squarespace Template or Design Kit
If you're down to do some (ok, ALL) of the heavy lifting, a pre-made Squarespace template or design kit can let you hit the ground running fast.
Pros: Fast, minimal investment and could help you learn a little about how it all works along the way.
Cons: There are lots of sources out there so make sure to do you research and check their reviews. Golive, StationSeven and Big Cat Creative are some of the biggest names in this category but other, smaller shops may offer more unique layouts for your specific niche or industry. When it comes to eCommerce, these are best for very small shops that focus on booking simple services and scheduling appointments since those things are less complex for the typical DIY user to get setup on their own. If you go this route, you'll also want to make sure your branding is pretty strong so that your site doesn't look exactly like the template ;)