Fellow SKP + Vray user here!
A bit of a heads up - the issue you’ll have is the UV mapping. Because you can’t create the extra channel that Unreal requires inside Sketchup, you will need Unreal to create them - it is not very good at this when compared to the likes of manually unwrapping your meshes in the likes of 3ds Max. This will mean a couple of things - you will either have overlapping UVs (meaning errors in how the meshes are represented) or you will need to break your meshes down into many, many small groups (the number of faces a mesh has determines this).
I model almost entirely inside SKP for simple mesh creation (walls, floors etc) then export to Max and unwrap there. I do not use the Unreal lightmap creation at all anymore, purely because it is a little unreliable and an unknown quantity. For complex meshes, such as furniture, SKP is a waste of time really. You don’t need to use 3ds Max though, there are free programs you can use which can do this, such as Blender, I believe.
If you jump on the asset store, you will see plenty of content you can purchase, such as furniture, which will work with little effort required on your behalf.
This may not make sense to you yet, so apologies if it is confusing - UV channels are a little tricky to get your head around to start with. I’m no established pro, but I was where you are now a few months ago, so figured I’d share what I know to save you some time/headaches.