That's because IMAC requires a scale type of plane so you see a lot of Extras, Edges, Sukhois and Yaks. Pattern you can start out with just about anything that you can stunt with.
I build and fly the old school pattern planes because they make great sport planes too. Todays pattern planes are much more advanced but you can fly the basics with planes like the Kaos or the nice little Venus Arf, Tracer ARF or an Ultra Sport. A lot of choices in kits or ARFs for basic and sportsman.
If you go into the Pattern Forum or classic Pattern Forum or IMAC Forum you can learn a bunch more about it.
I have the 01 Sportsman in front of me now. I fly it for fun. I found it at http://www.mini-iac/Sequences/2001/0...sman_known.hmt it shows you the what and how so you can learn to read the sequences. I think you just type in that address with the new dates and it may come up for you? I hope you can still get it there, 01 was a while ago.