Watch one or two You Tube videos to get the general idea. Once you adjust your poles properly (elbows at right angles, with forearm parallel to the ground), do try walking on level ground.
Once you get the cadence, and learn to lean on the poles to shift weight from your arms, shoulders, and loaded rucksack, you quickly learn two things:
1. You DO shift a significant portion of the weight on your back to the poles. I do not profess to fully understand it, but the manufacturers claim that up to 25 percent of the weight of the loaded rucksack can be transferred to your poles, when used correctly. This eases the strain on your shoulders and back, provides added traction when going uphill, added stability on slippery surfaces, extra braking force when walking down hills (important on the Camino), and makes improves balance, making walking easier generally.
2. The cadence of advancing the right pole with your left foot, left pole with right foot, etc., and repeat, becomes as automatic as swimming, bike riding, or ... (?) Once you learn it, you do not easily forget it...
Also, when not being used for walking, the poles can be easily wedged into most window openings to serve as clothes hanging places. I carry four, really long, heavy-duty rubber bands (trash can bin liner holder bands actually) and a number of lightweight metal "S" hooks to suspend my poles from curtain rods, or any other suitable thing (including the underside springs of the bunk above me in an albergue, to also use to hang wet clothes or my towel from. I can even make a nice privacy screen between adjacent bunks...
Yes, walking poles can be very useful indeed.
I hope this helps.