There are a number of great feeders on the market. When choosing a feeder start with one that is easy to clean. To keep hummers happy there is some routine maintenance involved, so a feeder that comes apart and can be reassembled easily will make it easier on you to perform these tasks. If you are just starting your community, a feeder with red on it will help catch their eye as they fly by.
Since some of these little guys can be quite territorial having multiple feeders spread out throughout the yard can help disperse aggression. Placing them with good distance and where there is an obstruction in the line of site from one feeder to the next, such as a branch, plant, trellis, or around a corner can be helpful too.
Clean feeders with hot tap water. Feeders should be cleaned every 2-4 days depending on the temperatures. The hotter it is the more frequent the cleanings. If necessary a solution of 1 part vinegar to 2 parts water may be used to soak the feeders, scrub any fungal growth, and then thoroughly rinse.