first off there is not a belt on this engine. It has a chain.
secondly you set the crank to 0 degrees (cylinder 1 on tdc) the timing mark and pointer/indicator on the cover/block should set you there.
thirdly get the cam turned so that #1 cylinder rockers are valves closed. There should be marks on the gears of both the crank gear and cam gear you can use.
fourthly the timing chain has 2 blue links that are specifically spaced and once you get the gears set in the right place those blue links should align with the marks on the gears.

thats it

easy peazy :o)