The first part is very simple. Within your initialization code, simply change the following line in red to the below:
In other words, instead of an integer like 0, change it to
gliderid: "canadaprovinces", //ID of main glider container
contentclass: "glidecontent", //Shared CSS class name of each glider content
togglerid: "p-select", //ID of toggler container
remotecontent: "", //Get gliding contents from external file on server? "filename" or "" to disable
selected: Math.floor(Math.random()*3), //Default selected content index (0=1st)
Math.floor(Math.random()*3), where 3 should be the total number of contents you have within the glider.
Regarding the 2nd question, the script currently doesn't expose any public methods for easily jumping to a particular slide unfortunately.