If your talking about peel and stick tile I can not warn you enough againt it.
It shrinks over time and gaps open up.
There's going to be some that will just not stay stuck down.
Near imposable to lay in a straight line because they like to stick before you can get them in place and can not be adjusted without breaking.
There so thin there going to show any flaws in the floor.
The color is only on the surface.
In most cases if the old floors in good shape you can go over it with new sheet linolium and have a seam free floor.