HAVE: The sign HAVE is an indication of possession or existence.
It is not a "request." Instead use "WANT," or "CAN HAVE?" or
"you-MIND I TAKE?" or some similar sign or set of signs but not
just "HAVE" in isolation.
PLEASE: In everyday usage the sign PLEASE "rarely" comes up.
I'm actually considering getting rid of it in my curriculum.
Instead we use "YOU-MIND?" or the question form of "ALRIGHT"
using the eyebrows up. PLEASE is generally only used as a
supplication to sway someone to give you something or do
something for you when they don't seem to be budging.
The currently most respected text on ASL grammar "Linguistics of
American Sign Language" explains that adjectives can often come
before or after the noun (YELLOW HOUSE)
or (HOUSE, YELLOW).
If you want to "really" understand ASL grammar, get that book. I
recommend seeking a used version since it is rather expensive.
(Which is perhaps why so many authors apparently haven't read it
themselves and are thus coming up with some really strange
grammar rules instead of those based on actual linguistic
research from experts like the good folks from Gallaudet
University who wrote the "Linguistics of American Sign Language"
I think it is important that curriculum writers start
emphasizing context. Chances are the signer would actually just
be signing: "MILK volume-height-LARGE" (just two signs -- MILK
and that specialized version of LARGE) in response to a question
as to what the person wants to drink. All of the other signs
would be wasted and thus unlikely to happen consistently in
actual everyday usage. The "please" concept would be show via a
smile on the face not a separate sign. The HAVE concept would be
"understood" from context. The "ME" concept would be understood
from context (the waiter just asked me want I wanted to drink --
obviously my reply will indicate what I want to drink -- not
some other person).
p.s. Please see:
p.p.s. I looked up that book on Amazon and I get the feeling it
is not a good one to be studying from. I recommend you get
something better like "Learning American Sign Language" by Carol