First thing to know in DIY outdoor fireplace is objective. You may not use fireplace every day, so consider the main purpose to have this thing on backyard. Your objective also determines the other aspects which are crucial before building outdoor fireplace from scratch. If you do not have the experience in this filed, professional help is much recommended. However, it does not mean you can’t make your own fireplace by yourself.
Design is at the top list to start. You can consult with designer regarding the design for outdoor fireplace. Simple design is long box style with open façade to put the fire. Chimney is necessary to get rid of smoke. Well, install this thing on top. As mentioned above, the objective of fireplace affects its design. You may create fancy design as long as it suits the main objective when you utilize this fireplace. Another thing is location. Backyard is good place, but you need to pick the right spot. Try to give space between the main building and fireplace.
You already have design and location; then the next thing is to prepare material. You can ask friends to help or just hire professional. However, the main overall project is your responsibility. Creating outdoor fireplace requires knowledge and skill related to engineering and architecture. You need to read the extensive reference and book to understand the basic and necessary things before making DIY outdoor fireplace.