Some guidelines when looking for a home to rent are to know exactly what amenities are wants versus needs, and to have a general desired location in mind. If you have a pet, you should also ensure that every property you visit has a pet policy that suits your needs.
Another guideline is to set yourself a manageable budget and only look in that price range so you do not become disappointed if you find something you can't afford. You also need to decide whether you want to rent a house, an apartment or a room somewhere, and if you are willing to share with a roommate. You should decide all these things before you begin your search to make things easier for you and your Realtor.