This video shows the "how" behind making a color background without the color affecting your model. 

If you applied your materials carefully enough in Sketchup, your model will look fine when you change your Render "engine" from Eevee to Cycles. Working in Cycles essentially gives you superpowers (like mirrored surfaces, glowing surfaces and perfect shadows) but you absolutely need to put the graphic card to work to use the extra features effectively.

In which I turned different colors into mirrors, glow-lights and glass. Some effects require the Cycles engine. Glass,  especially, takes a long time to render as it create very accurate simulations of light paths.

Blender has some cool 3D text tools. While looking for ways of coloring Blender models we realized that exporting as a GLB file allows models to be opened and colored with Paint 3D. Before closing Paint 3D, save and import the file back into Blender to try rendering both images and videos!. You will probably need to use the (S)cale keyboard shortcut to enlarge your models when you get back to Blender.