Metaspoilt Help

Hello guys,

After installing a meterpreter in the victim's pc and gaining acces to his computer how can i find out his passwords?Email,steam,gmail,blog,etc.Shouldnt it be in a folder in some hash form?

Can i have a remote GUI acces of his pc,if the pc is close?

Can i install a exploit on his computer without he open the program i send to him?

If he install my program and he clicks on it,I have acces on his pc until he close the program,or i have acces any time?

Thanks guys.And a bonus Q.What laptop do you recommand me to buy?The buget is 500-700$ max.