thanks for your question, you can use both Realtor and Property management firms, it is all about what you really want to be done. a realtor will be able to find you tenants and possibly sell the home for you when the right time comes, however property management firms may help you in collecting rent and work on any tenant issues weather it is maintenance, financial and or logistical.
In my opinion the best bet is to find a realtor who is doing both, Real Estate and Property management, this way you get the best of both worlds be careful there isnâ€™t a lot of these people and if I were you I would interview and check them out carefully.
Good luck with your move and donâ€™t worry based on what you suggested in your question, you seem to be making the right decision.
RE/Max of Naperville