shipping problems...I don't know what I'm doing!

Am I missing the one FAQ that walks me though shipping? I can't seem to figure out what I'm doing.
I tried to do the USPS module thing, but couldn't figure that out, so i decided to do flat rate, but actually i need 1st class, priority, overnight and international (with several different options). how do I do this?

I have it set to flat rate at $3.95, but it still says 'free shipping' when people are buying my stuff!!!!! Why??

God I'm so confused, I'm sorry. :no:

Goto modules-> shipping

Then install USPS then just follow the guide lines it gives you:

Creating a customer account for USPS realtime shipping quotes

1. Info on USPS and Rate Quotes
2. Create a USPS Web Tools account
3. Fill in your customer information details and click Submit
4. You will receive an email containing your USPS rate-quote Web Tools User ID
5. Insert the Web Tools User ID in the Zen Cart USPS shipping module.
6. Telephone USPS 1-800-344-7779 and ask them to move your account to the Production Server or email them at [email protected], quoting your Web Tools User ID.
7. They will send another confirmation email. Set the Zen Cart module into Production mode (instead of Test mode) to finish activation.

Once you get your ID it should work fine.

Please note: ALL of your products must have a shipping weight to get accurate rates from USPS or UPS.