(Related to the previous question) How to make a good lounge with free models?

I'm nowhere near a "developer," but I am trying to make a lounge only using free models. (I know no other way to make one.)

Scripting really isn't in my ballgame, I'm not educated enough to do it. I was told I may have gotten a virus that redirects to other games from using free models,(A) so how do I prevent that from happening? (B)And what does it mean to not use free models? (C)Do I need to just toy around with them and home for the best?

Thanks to anyone who takes the time to read this! Kindest regards~DlRTBAG on Roblox

the best way to do it is to not use free models