Nothing I like more than burning a field. The MDC actually helped us with ours the first year, even provided cost share assitance to have a dozer with a cat disk come in and put in firebreaks. The DNR provided a water tank with spray gun on a trailer and drip torches as well, no charge. Missouri provides a burn workshop for land owners that you have to go through if you want to use their equipment.
Firebreaks make the job a whole lot easier. But I know many don't have that luxury. We have burned some small lots without them, 2 - 3 acres or smaller. My recommendation, have an ATV with a 25 gallon water tank and spray gun mounted on back, back pack sprayers filled with water, get some burn mats, and a leaf blower is also good. Drip torches make the job easier but are not a necessity.
Do not burn in high winds, do not burn when everything around you is bone dry, do not burn by yourself, do not burn under power lines as smoke will conduct electricity. I've watched fire run across a field like water, it can be very scary. If you don't have firebreaks look at starting a head fire to give yourself a cushion before you go after the entire field. No matter what, go slow, you won't get the best burn that way but it will be the safest. Also be aware that once you have a fire going it will suck air and cause wind direction to change.
Fire is an excellent resource if used wisely, and is a good way to clear a field for food plot preparation if you don't have the farm equipment to do the job.
Best of luck.
If you have neighbors who may be effected by smoke, or roads that might be effected be sure to contact them as well as local fire department and law enforcement.
“There are two spiritual dangers in not owning a farm. One is the danger of supposing that breakfast comes from the grocery, and the other that heat comes from the furnace.”