Couple Questions About My New Database

Hello everyone, im new here and i have some basic access knowledge, little knowledge about VB. Im looking to create a access database using access 2000 -- I know what I need and how to create most of it, however, I do not know how to do a few things, input for improvement or recommendations are more than welcome... Heres the design

Im doing a fairly simple inventory control database, it will have about 8-10 fields:
FAX# (date)
DATE (date)
NAME (text)
EMP# (number)
UNIT (text)
SIZE (text) (this is static and will be combo box drop down)
GENDER (text) (same as size)
POSITION (text) (same as size)
SENT (date)
AMOUNT (number)
RECEIVED (number)
PO# (text)

I need all of that in a form, which I can do, what i also will need on the form is the current amount which be determined by RECEIVED - AMOUNT, which I need to some how show up on the form (this i dont know how to accomplish) ive been trying to put a formula into a text box like =SUM([RECEIVED]-[AMOUNT]) ... it works okay, unless i copy from excel to the table which the form uses, then it doesnt see the items i copied into the table, only the items that were typed in using the form. I also I need to put like a box below the text boxes which will display a query (which i dont know how to do) -- this box will display a query (ie. if i wanted to filter out all , and only see SIZE = xl GENDER = male and then the box will show up in 'table' form all the people who meet that requirement.)

==============================================
= Gender [M/F] Size [XS/S/M/L/XL] Position [K/C/W] =
= Name [ ] Unit [ ] Emp# [ ] =
= =
= Date [ ] Sent [ ] Fax [ ] =
= =
= PO# [ ] Received [ ] =
= ------------------------------------------------------- =
= Search [ ] Amount Left: X =
= ------------------------------------------------------- =
= || || =
= ||---------------------------------------------------|| =
= || || =
= ||---------------------------------------------------|| =
= || || =
= ||---------------------------------------------------|| =
= ------------------------------------------------------- =
==============================================

Thats the best ascii drawing i can do of what invision...
:) Thanks for any help in advance.

AD