Texturing/ligh small Scene

Hi, i wanted to ask for you help
Ive done a super short set to be used with the green screen afterwards, so it needs to look a bit real
Since im a complete noob, i cant texture/give light or color it very good, it always ends up being a bit shalow :frowning:
if anyone has any idea or tutorial or could give some help, i would apreciate

this is the set