Need a bit of help, am about to remove the right hand cylinder head and am unsure of the following

I have read somewhere that there are two types of head bolts and that the stretch bolts need to be replaced, one type is a spline drive and the other hexagon, but need to know which one is which.

Also understand that one type of bolt has a torque setting and the other is based on an initial torque and then 90 degrees.

Will I need to purchase any special tools to do the job properly.