Blaine,

You can buy a dip net and stalk them which takes time. You have to wear polarized glasses, sneak up on them and then swipe the net at them and may only catch one or two at a time.

If you have an open area of your pond where a seine can be run then that is a better option. 30'-50' long seine that is 4' deep will work well for what you are trying to do but will require 2 people to work it correctly. A seine in the 12'x4' range can be used alone but will not be nearly as effective but may work if you only have a small open area of your pond.

I would try to get your LMB before they reach 2". This is the size that is easiest to train. Live brine shrimp are a good starter food and if you can get access to the fry of FHM, GSH or gambusia, they are also good. Get the bass accustomed to you and the food you bring. Eventually you can switch from live foods, to dead frozen but thawed foods, such as frozen brine shrimp, blood worms, etc. Then you can switch to freeze dried foods. Once your bass are eating this solidly, then you can switch to pellets, this should take a couple months to do.

To keep them on pellets, I would keep them feeding on pellets for at least this year. Raising 50 LMB will take some serious resources such as an RAS. Not sure a 100 gallon tank will be large enough...