Welcome to the forum.
You’re free to post a request in the Request’s Thread here:
Why not? We do 
How do you think you can “own” a “demon”, and why would you want that kind of relationship if you’re not into magick? You will have to be doing magick to communicate with it, surely?
Or did you mean you will owe someone that does free work for you?
You best bet is to purchase a Ritual for Hire here:
If you’ve been here a while they you know we’re all about helping you learn to empower yourself and less about fulfilling spell begging requests… and you have probably seen this to get you started:
Please don’t spam this forum with spell begging, if that’s what you mean. Just make a request once in the Requests Thread I linked above, that will do fine. 
I honestly suggest you start learning, at the very least with protections and wards. Needy energy like this can and will attract parasites, both human and otherwise, who will promise you anything to feed on your energy and never deliver.