Hi Geraldine,
Yes typically a Realtor can help find you a rental property. Sometimes for apartment complexes, it might be best going directly with the leasing office.
If you are hoping to buy a house, you likely have a budget in mind. Hopefully, that budget includes fees that come with the process, not just the purchase price. The good news for buyers is that they aren't directly responsible for paying their agent. Agent fees usually fall on the seller.