USPS API problems?

[shamis]

Excuse me for being totally lost but I still don't get it. I will be shipping all packages via usps, mainly the flat rate boxes & envelopes. So I guess my question is

1. What should I set my tare weight too when I don't even understand what it is or how it's calculated (I have read the tutorial and I have the zencart ebook and still clueless)

My product is hair extensions that comes pre-packaged and weighs 4ounces total. So all I do is put it in usps flat rate priority mail box. I don't ship large packages.

So am I too weigh the flat rate box and use that as my tare weight? and for "help now" sake lets say that the box weighs 5 ounces, given my product weighs 4oz, how would that be entered into admin?

Sorry guys but I have searched and searched for this info.

TIA

Well I think I fixed it, I just entered 0:0 and now my weights show up correctly in usps. But this could pose a problem if and when I expand my services so if you guys don't mind still letting me know the above, that would be great.