To answer your questions, the rights of both parties depend on the agreement you make. As for the cost, writers are the proverbial "dime a dozen" and most work so cheap they should be easily affordable.

I am curious about your statement that you don't need an experienced writer. If you want this arrangement to be beneficial, you will want someone experienced. If you get average writing, you will be wasting your money IMO. The writing must meet a specific purpose or I can't imagine why it would be worth hiring someone at all.

There are bid for work sites all over the Internet and certainly a lot of them for writing. If you want cheap, you will certainly get it using these services. I can't say I recommend this, but it is out there.

I provide writing services, especially when it is part of a graphic design or web design project. I have found that good writing cannot be rushed, just creating an effective title can sometimes take hours. Short articles do not take less time, they usually take longer because you have to pack more power with less words. As a result, good writing is not cheap, but the ROI is great while average writing has a virtually non-existent ROI. That is something you may wish to consider in your objectives.