Looking for a poem, possibly named "The Price" either by Edgar Guest
or Robert Frost. The first line is "I'd like to tell the children, and
I wish I knew the way ..."

Unfortunately I couldn't find the poem you're looking for. The only
poem by Edgar Guest guest I could find that has something about
"children" and "knowing the way" in the first few lines is "Father":

My father knows the proper way 
[...]
He tells us children every day
[...]

http://www.amandashome.com/father.html

Kind regards,

rhansenne-ga

The poem I seek might start as follows: "I would like to tell the
children and I wish I knew the way, that for all that the future
offers, there is a price for them to pay. For he who will be a doctor,
and sooth and save the ill, must earn with years of study, the wisdom
and the skill, and he who will be a ...."

Mayby you should buy "Collected Verse" for example at amazon.com:
http://www.amazon.com/exec/obidos/tg/stores/detail/-/books/1568491085/reader/7/002-1121631-3740869#reader-link
There is "The Price" .

You can also look for it at ebay:
http://search.ebay.com/search/search.dll?query=edgar+guest&newu=1

Edgar Guest did write a poem entitled "The Price" but the first line
was "Into the court he came.  Beyond a doubt..." and the last line
read "I pity him the bitter price of wrong  Good men ask him to pay"

A quick search for a Frost poem with that title did not yield
anything.

Have you tried searching Grangers Poetry Index, or any of the other
sources that you can find at a public library?  If your local library
does not have the sources needed to id the poem - the librarians can
call a larger library and ask the question.  Or, if you prefer, you
can call the reference desk and see if the librarian can research the
answer to your question.  Why spend money at Amazon or other book
stores when you can find the information for free at a library?  Put
your tax money to work for you.  Librarians LOVE to help.