Simple and cheap VMS for retail store?

Hi I’m need some help finding VMS for my clothing store.
I saw about 2000 VMS on eBay, but being a newbie in this industry, I really need assistance to decide what to buy? Here are some functions/ features that I hope it has:
– Effective video analytics features
– Constant recording
– View from afar
Any suggestions are welcomed! And thank you in advance!