First time 2h solo Endurance - help appreciated

Hi guys,

yes, sorry, another one of these posts. I am gonna race my first solo 2h endu today - the GT4 in the nurburgring.

Can you help me with how things go regarding tires and maybe fuel?

do i just fill up on full gas until the last stint, where i figure out how much i will need?

and what about tires? when and how many do i change?

i guess it gets complicated with the forcasted rain - how do i go about changing conditions, when and how do i change tires from wet to slicks or the other way arround? do i change all 4 on the same time then, when i think its the time to switch?

help is really appreciated, i am pretty excited and a little anxious already!

thanks guys :)