Grannyjaneb - your 2009 Micro Lite is very similar to my Mini Lite. The clear elbow is an add on. You do not need to have one starting out. When you do a more thorough clean out of you black waste tank (more than just emptying it), the clear elbow allows you to see how clean the water is coming out or if waste is still coming out. That is a more advanced procedure. You do not need to do that starting out.
I don't think you need a manual. Emptying the tanks is pretty simple. Read this forum and learn from the mistakes of others.
Basically, you should have a set of disposable plastic gloves. Connect your dump hose to the TT. You may want to purchase a 90 degree elbow that you attach to the other end of the dump hose so it fits well in the dump drain hole. Once you have the house in the dump drain hole, open the valve to the black water tank first. Let the black water tank empty completely. Close the black water tank valve and open the gray water tank valve. This empties the gray water but since the gray water is usually not too dirty (dishes and showers) it also rinses out the dump hose.Then close the gray tank valve. Disconnect the drain hose and replace cover on TT. Often there is a hose at the dump station to rinse out the dump hose. Then return the dsump hose to it's storage. Throw away the plastic gloves. Wash your hands or use that hand sanatizer stuff. And you are done.
Welcome to the forum. You will find many answers to your quetions here. Enjoy your new Micro Lite.