On a slightly different tack, many NMRA regional meets include operating session components. I suggest checking out a few of those. In addition to the clinics, layout tours and other worthwhile events, the op sessions will introduce you to "how others do it" which is a great help in deciding what you like and don't like. You'll also meet lots of great people.
Up here in Vancouver we draw people from all over the North America several times per year. We have operating events associated with the annual Vancouver Train Expo in November and the Railway Modeller's Meet (of BC) which this year is just around the corner in May. Both events have ops suitable for beginners. In fact at the last RMM(ofBC) meet, 2 of the C&W's 8 crew had never operated before and one had never held a throttle! We also have recurring and spontaneous invitational meets/sessions which tend to be for people who take ops a bit more seriously...if you can ever take playing with trains seriously! The layout owners in Vancouver all welcome new operators...selfishly, new operators are eventually the source of new layouts for us to operate on! So lots of ops going on, you just need to know where to look.
If anyone on TRW in the Pacific Northwest is curious about Ops, the May RMM meet would be a great start. We have 10 layouts (3 N scale not that that is significant for ops) operating over two nights including a "intro to TT&TO" session. The ops part of the Meet is very popular and fills up quickly so early registration is advised.
http://railwaymodellersmeetofbc.ca/ {end paid political announcement
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