My goal is to prepare a specific IV solution for research purposes.
The 500ml IV solution must contain the following:

Sodium Ascorbate (Vitamin C) - 50-100grams
N-Acetylcysteine (NAC) - 10grams
Inosine - 8grams
Calcium Gluconate - 500mg-1000mg
Ambroxol - 800mg

Those are the active ingredients. I have already read online material
such as this:
http://www.orthomed.com/civprep.htm

The above URL refers to "lactated Ringer's" and "edetate disodium," if
these elements are unnecessary I would like to forego using them.

I'm looking for someone to teach me exactly how to prepare this
assuming no prior medical knowledge.

I have a source for 500ml iv bags containing sterile water. I also
have sources for Sodium Ascorbate
(http://www.nutri.com/wn/wn-pl.html), Inosine
(http://www.lef.org/newshop/items/item00140.html) and Calcium
Gluconate (http://www.myvitanet.com/cagl7ozponow.html).

Obviously, my preference would be to just cut open top of the IV bag
containing the 500ml of sterile water and dump in the Sodium
Ascorbate, NAC, Inosine, Calcium Gluconate, Ambroxol, and mix it up.

However, I have read about osmolarity and pH for iv solutions, and I
assume these must be of importance. However, I'm not sure how to
calcuate these nor do I understand how important these are. An
explanation using simple, non-technical terms would be helpful.

There some important problems whith your question, and I doubt that
anyone is going to provide an official answer to your question, as
what you are doing seems to be quite dangerous.

I am not trying to attack you personally, but I think that you should
seriously reconsider what you are proposing.  The problems of pH and
osmolarity are the least of your worries.

Essentially, if you do not understand the ramifications of mixing IV
solutions, you should not be administering them to people (or animals,
for that matter).  You could cause infections through unsterile
procedure (cutting open the bag and dumping the stuff in,
ferchrissakes?!), electrolyte imbalances (Calcium Gluconate), allergic
reactions, reactions to the chemicals that you're administering
(Ambroxol and Inosine), not to mention unknown problems from mixing
these things together in a bag.

What you are proposing is dangerous, unethical (insofar as giving this
solution to people or animals is potentially harmful or fatal),
certainly illegal, and generally speaking a bad idea.  Please do not
do this!

I realize that many people are excited about the potential benificial
effects of  various herbs, "natural substances", chemicals, and so on,
but you can't just mix them up and drip them into a vein to find out
what happens!