Hops will do well in Iowa. I am growing hops in Minnesota very successfully. As a beginner, I would start with Cascade, Magnum and Nugget hops. These varieties do well in our area, easy to grow, are resistant to most hop diseases and are bountiful producers of hop cones - not to mention very aromatic(Cascade) and flavorful bittering qualities (Magnum and Nugget).
Always start from Hop rhizomes or hop plants(rare to find) and stay away from hop seeds. Only female hop plants(from rhizomes) produce hop cones (hop flowers) and males can introduce unwanted cross pollinization (both your hops and nearby hops).
Here is a list of
where to buy hop rhizomes online. You can also obtain hop rhizomes from local homebrew supply stores, hop growing friends and fellow hop growers in your area. Best of luck.