Hello,
You can make the slider full width by removing offset for the column – https://prnt.sc/rqmidb
Height of the slider you can change here – http://prntscr.com/rqmr4d
Size of the image depends on your needs, for example – https://xstore.8theme.com/ https://xstore.8theme.com/wp-content/uploads/2018/08/home-slide-2.jpg http://prntscr.com/rqmt8w
Also, watch this video – https://youtu.be/_dVwgeruFJk
This is http://prntscr.com/rqmuit just for demo.
Regards