Pam,
It is never too early or too late to start herding. I started my boy at 9 weeks of age on ducks, but we couldn't really begin the "real" work until he was older and his body was more mature. Herding is very hard on the mind and body of a dog and should be approached in small doses. Typically you only want to work them for about 10 min., take a 15 min. rest, then another 10 min., etc. You will find that your dog's mind wears out long before the body does, so you have to be very aware of that fact. Once they build up the mental stamina things go more smoothly. The other reason for working in small bursts is so the stock doesn't get too stressed either.
Okay to answer your questions:
1)answered above
2) Once a week is fine and very typical, just realize that you'll progress more slowly and probably spend more time at the facility that one day.
3)Practice random "downs" at home on and off leash. Then when you go herding, make sure you practice lots of downs while just walking around the facility. Make sure she is on a loose leash and listens to you. Enforce the downs. I wouldn't even considering working stock until she will listen to you outside the arena. It is dry work but it will pay off in the long run if you are diligent. I do this each and everytime I go herding even with my most experienced dog. It is a good reminder of who is in charge and believe it or not, tells the sheep you have control of your dog. Also, when I enter the arena, before I take the leash off, the dog must be on a loose leash and do at least one immediate down before we begin. If he doesn't, I've been known to leave the arena and start all over.
4) It is hard to practice away from stock, but one basic game you can play is to take your dog to a tennis court. Place yourself on one side of the net toward the sideline. Throw a ball over the net and send your dog. You can start teaching the directional commands this way. If the dog goes clockwise, say "good go bye", if the dog goes counter-clockwise, it's "good away to me". Eventually you will work your way to 1/2 way between the sidelines (middle of the court) and be able to direct your dog which way you want him/her to go to get the ball. This exercise takes patience and time. Don't push too hard or too fast.
Herding is one sport where your dog knows more than you do, so give yourself plenty of time to learn it. It is a complex sport in that you not only have to learn to read your dog, but you must read your stock, the weather, the conditions at the facility, and who has worked the stock before you. There are many factors that can determine your success that day, it isn't just you and your dog for this one!
Just remember to have a great time!
