Writing is an art, a craft, a profession. It is also a business. Of course you should. It isn't easy to get an agent, but it can be done, with persistence. The best way is to get an appointment with an agent at a writers' conference, while at the same time having completed a wonderful book.
Agents are wonderful people.
They can get you more money, they know who does what and who needs what and who likes what. They will argue with editors so you don't ever have to. They go to lunch with editors and call them by their first names. I used to believe writers lived on Mount Olympus with all the other gods. I have discovered over the years that editors are often quite kindly human beings.