I put most of what I know about pacts in this post - remember most pacts go both ways, that spirit IS likely to ask you to do things for them, and unless you get boundaries in that reflect who you are, and not who you wish to be (or think you “should” be) you may be confronted with requests you’re just not capable of fulfilling.
On the other hand a solid pact that recognises both your weaknesses and your strengths is a glorious thing for both human & spirit, and means you can both get the most out of this when they request something, whilst also having a lot of fun! 
Remember as well spirits don’t judge us by the same standards as potential bosses scanning a CV or whatever, so put all your nastiest traits in there and don’t try to pretend you have strengths where you don’t, this is the one occasion to bare your soul and let them see you in all your truthful crazy glory.