Do you need to put glue down to install stick on tiles

any stick on tile I have ever seen comes with the adhesive already on the back. It is covered with a wax paper which you peel off, thus the name "peel and stick"

No, you don't have to use glue, but you really want to prep the area well so that it's clean. If the surface is shiny where you're going to install it, it's best to use a bonding primer. Click on the link below to read more. BTW, I have some peel & stick in my master bathroom and it's been there over 30 years and it still good. Wishing you the best.

https://www.homedepot.com/c/how_to_install_peel_and_stick_vinyl_tile_HT_PG_FL

Nope. Just make sure the floor is very clean with any bumps smoothed down or pits filled. If you don't, they will wear through.

https://www.google.com/search?rlz=1C1BLWB_enUS700US700&biw=1422&bih=684&tbm=isch&sa=1&ei=_E2IWpfMI8yyjwOp25DQDg&q=installing+stick+on+floor+tiles&oq=installing+stick+on+&gs_l=psy-ab.1.2.0i24k1l8.17788.45043.0.49178.20.14.0.6.6.0.74.754.13.13.0....0...1c.1.64.psy-ab..1.19.791...0j0i67k1.0.HPN8Jzc-nyc

https://www.google.com/search?q=installing+stick+on+floor+tiles&rlz=1C1BLWB_enUS700US700&tbm=vid&source=lnms&sa=X&ved=0ahUKEwi3_KjYpa3ZAhVY8WMKHYMKCaUQ_AUICygC&biw=1422&bih=684&dpr=1.13

No