Furnishings and materials

Hi everyone, I've been using Sketchup + D5 Render for a month but I'm having a lot of difficulties. I am an interior designer, so for me it is important to be able to use real furniture. I used the Archiproducts site but I noticed that it was really difficult to find furniture formats compatible with Sketchup. I would therefore like to ask everyone for advice on where to download real furniture, from real brands and not designed by other users from the Warehouse library. I would also like to know where I could find other PBR materials to download and then use them in D5, the textures present are excellent but I would like to have more choice. Any advice I can get is appreciated since I'm a newbie