What I need to know before buying a theme

Hello guys, Before buying a theme for my site I would like to know if I can do a kinda of e-commerce with a dynamic page where users and sellers can subscribe and only sellers can write into the home in cascade and public items. and ofc I need something to filter items per hours etc. is it possibile? there are themes to support this kinda of site?

Hi,

I dont understand your question? Frist you will not find out of box solution. Second what will write on what tag will be filter etc?