Need some help moving some buttons around and adjusting banner

Hey, i have recently started using wordpress to build a website. ( i have not much previous experience building website before) but with some help from some friends im managing (kinda lol).. i can’t find a plug in to where i can move the buttons around on my page. If anyone could help me that would be great. http://casnerphc.com/ is my page.

Also i want by banner to stretch the whole page which again i can’t seem to find out how to do so..

Thank you soo much for you help, its greatly appreciated.