it should contain these,
for the amount you pay,
I will do this and this,
and you will get this and this,
and for that and those are not included,
you need to pay this amount at this time or by this time,
and I will give you this thing at this time or by this time,
I will try my best to do your job, but I can't be responsible for anything that beyond my control.
so my liability only limited to this.
if you are cool with me, please agree and sign your name here.