Riah,
Congrats on the land, but Bruce is right. If you live in a terribly arid area and have no
hugel mounds and are otherwise gardening conventionally, then irrigation is probably a must. I personally recommend drip irrigation. I have used a company called dripworks (dripworks.com) that has good quality products at reasonable prices.
But an acre under irrigation might be a bit much to afford on the first year. Perhaps you could put part under drip line irrigation and hand water the rest, expanding as you get the time and money.
Also, mulch is your best friend. Fortunately, it is possible to grow your own living mulch right in place.
Let us know you climate and soil. We can probably help you better. Good Luck!
Eric