The more comfortable is using a remote system like Real VNC The best for use a mouse on your Android tablett with an USB / OTG / connector! (Right Click and Wheel are well emulated) Of course your computer must be opened with SketchUp! On a SmartPhone it's many less comfortable... The "free" version on a Browser must be working also on an Android Tablett! So no need mouse Else you have the free "SKetchUp Viewver" for Phone https://www.youtube.com/watch?v=vwwAaFrkYvY

Refer to the System Requirements article here. In general you will need a computer with a suitable graphics card. Integrated GPUs have never been recommended and historically Nvidia GeForce and GTX series cards have been the best at supporting OpenGL. SketchUp only uses a single CPU core so multi-core CPUs don't add anything. Speed will be more important than number of cores. Many rendering programs can utilize more threads so if you plan to do that sort of thing, investigate their system requirements, too.

Kinda really depends on the model. Good model easily done.