I think the easiest way to accomplish a Kamehameha wave would be to mimic the show. some information:
.this concept can be used for flying.
this principle can be used for other attacks (final flash, spirit sword, etc...)
in the world of dragon ball, there exists a life force energy called Ki (pronounced key) based on the real-life concept of chi (but as-of-Z taken to the illogical extream) the main focus point of Ki is in the center of your body. every thing in this second block of text that is not bracketed up until now is true to the concept of chi the DBZ based it's Ki system off of and is needed to understand the rest of this guide, so let's get into the stuff that's (hopefully) only possible in the dream world:
step 1) enter the dream world (preferably lucid)
step 2) find a target (preferably a bolder or something like that)
step 3) channel Ki into your stronger arm and hand (example: right arm, right wrist, and right hand
step 4) hall off and punch the target. for my example, I will use a boulder. if done correctly, you will get one of two outcomes;
number 1] the bolder will go flying
number 2] the Boulder break apart in some spectacular fashion
(typically a violent explosion, or a fist sized hole)
step 4 (continued)) if done incorrectly or with insufficient Ki, it will hurt. the point of this exercise is to get you used to the feeling of manipulating ki via localizing some of it to one part of your body to increase muscular strength (arms) and durability (hands (this is how Gohan was able to deflect bullets in battle of gods))
step 5) repeat step four until you can do it repeatably and reliably
Disclaimer
from here on out you need to be careful of your ki output or you could destroy your dream world. please note that this might also feel draining but this won't affect your real body or your ability to sleep well.
step 6) assume the Kamehameha charging stance
step 7)carefully channel Ki into a ball between your hands, the more you channel, the grater the charge.

Originally Posted by
Goku
Kaaaaaa... Meeeeeee... Haaaaaaa... Meeeeee...
step 8) assume firing stance and expand the ball into a beam.

Originally Posted by
Goku
Haaaaaaaaaaaaaaaaaaaaaaaaaaaaaa...
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