Welcome to this mini guide of how you can use your max files and convert them into sketchup
In interent there are a lot of sites with free models, one with very nice database and hq models is
it links you to other great sites as designconnected with very nice collections and nice filter system to find furniture by author, manufacturer,
**This is the important part -relink your textures and make it visible in the viewport
You can try and buy this plugin here:
you can find this plugin here. Group exploder from TIG, you will need to use Ruby console