Ron,
I would go to Google and do a search on sporting clays; you will find tons of information.
SC started in the UK at the beginning of the last century and came to the US in the late 80's/Early 90s. (Depending on where you live)
It started as a simulation of hunting but passed that level about 75 years ago. It is now a tough competitive sport with World Championships and the rest. Unfortunately, very few people can make a living at it so don't give up the day job.
A psorting clays 'Course' is comprised of a set of stations. In the US you usually get from 10 to 15 stations in a course and will shoot at 100 targets. You may get 4, 6 8 or even10 targets at anu one station, the total will be 100.
Each station offers a different presentation of targets. The common form will be two throwers called traps, called A and B. Most often you will get a target launched from A when you say PULL and the second target, from B will be launched when the gun fires. This is called a report pair - ie the report of the gun tells the trapper to send out the second target. You will also get TRUE pairs, - that is both birds in the air when you say PULL. Sometimes, we get fancy and have
Single from A (use two shots if needed)
Single from B (use etc)
Report pair A then B
Report pair B then A
Finally a true pair.
Targets are thrown at different angle speeds and distances. There is a rabbit that rolls along the ground, occasionally skipping a little, and there are 3 sizes used, small, smaller and 'I did not see that'… actually they are 108mm, 90mm and 60mm in diameter. If you know trap or skeet then 108 is the size of a Standard clay.
People use all sorts of guns, but nothing larger than a 12 and no shot larger than 7 ½ for safety reasons. A single barreled gun has the disadvantage that you may get a close target and a far target so you have to shoot one of them with a less than ideal choke. However, the 1100 with interchangeable chokes will do fine. You are (currently) limited to 1⅛ oz of lead, and I suggest you just shoot 1 oz as that is enough.
In all honesty getting out there with whatever gun you have is much more important that worrying about getting the right equipment.
Hope this helps
Roger