Hey there,
Justin here - I can help shed some light onto that for you if you'd like!
My main suggestions would be to first read this blog post about what you need to know about warehousing and fulfillment and making sure you're making the best choice.
You'll probably want to look into a logistics company to handle and store your items. :)
Hope that helps!
Justin | Shopify Guru
support@shopify.com
