No question is a stupid question.
We all have to learn some way and if we do not ask questions, we do not learn.
Free lunging is round pen work. You fence in a round area and work your horses in a circle with only a lunge wip. No contact with the horse except to flick the wip if they stop or slow down. I do 5 minutes in one direction before I turn them the other way and do 5 minutes, then back the other way 5 minutes and so on.(this builds up mussels on both sides equally.) You need to start them off with walking and troting. I usually start with about 7 to 8 minutes every other day the first week, then 10 minutes evey other day the second week and work up from there in increments. I like to get them up to 20 minutes a day 5 to 6 days a week. Make sure that the round pen is not too small, if it is, it will be hard on their joints.
I also use a gator (or a golf cart or 4 wheeler) so that they are trotting alongside me and can go strait and get out to see other sites. This helps break up the monotony of training for them too. The only thing with this, is some of them spend their whole time pulling against the lead. Try and train them not to do that.