Easiest way is to upload to 3D Warehouse and paste embed link in your site. Explained here: https://help.sketchup.com/en/3d-warehouse/sharing-model-website-or-social-media
Just tested it on my site and works great. I like that there is a sidebar tab that lets you select the models scenes, etc. http://www.sargeantillustration.com/model-embed/
Walking around a “rendered” model is a different story. You could export a series of rendered 360 degree views. Most rendering plugins do this. It’s not totally interactive as you’re locked to each vantage point and can look around from there. Example: http://www.sargeantillustration.com/caytonvr/
You can take this method further by linking together multiple 360 views into a ‘virtual tour’…you’d need another program to do that. Something like this: https://krpano.com/tours/paris/
Once you figure out what works best for you, come back and share your result with us!
*edited, I haven’t tried this but look at SketchFab as well. I added an embed to the 3D Warehouse embed test page above.