There are plenty of commercially made indicators to use for fly fishing. Of course, as a beginning fly fisher, you will encounter those that abhor the use of an indicator and liken it to using a golf ball size, red and white bobber with a chunk of night crawler beneath.
The use of a strike indicator to present the fly will be your choice. I am presenting an option for a home made variety, strike indicator. I thought it unique enough to present it for creating your own ‘micro indicators’. Check out the other Allen Brothers how to links as well.