By December of 1999 Shuttle crews are expected to add a truss structure, heat radiators, and some giant solar panels. This addition coupled with the Russian module will put ISS well on its way to becoming the largest and easiest artificial satellite to see. Since 1986, Mir has been this planet's only continuously operating space station. It is quite large and thus is easy to see from the ground. You should make your Mir sightings soon as possible since 1999 may be its last year.
Plans are to drop it from orbit and allow it to burn up sometime in the summer.
If you want to find out how to see Mir, the International Space Station, an Iridium flare or some other satellite, the information is out there for you on the World Wide Web. I recommend two sites in particular. Satellite Predictions from Heavens Above. From there you can input your location and it will give you a Web page that you can bookmark with information on seeing Mir, ISS, Iridium flares, and more. Or, use This Link to check on their satellite visiblity predictions for Wichita, Kansas.