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I see that @Anonymous answered your question while I was copying content from the user manual, but I'll go ahead and post what I've gathered.
The three columns near the right end of the File Exchange template are for the names of your business policies for shipping, payment, and returns. If you are using Business policies, be sure your policy names are added to those columns. The other columns that would have been used for shipping, payment, and returns can be eliminated -- except if you have a calculated shipping policy where dimensions and weight must be included.
The PayPal columns are not supported by Managed Payments. The warning appears to say that leaving PayPal in place is OK and that eBay will remove it during listing.
If you are not using Business Policies, then the missing shipping service and related columns must be populated. For calculated shipping, these are some of the columns you might need (refer to the manual for all available options):
PackageType > USPSLargePack (or PackageThickEnvelope)
ShippingType > Calculated
ShippingService-1:Option > USPSStandardPost
ShippingService-2:Option > USPSPriority
DispatchTimeMax
ShipFromZipCode
WeightMajor
WeightMinor
PackageDepth
PackageLength
PackageWidth
If you are not using "policies", then yes, you need to fill in all the columns for shipping and returns. See my post for the column headings you should populate for shipping.
I also recommend that you just select one or two lines for your first upload. When you have a large upload file, you can quickly run through your 5K daily row limit by uploading large files that are failures. Better to start small so that you'll have more retries available during each day.
In addition to the basic template that you are using, please look at the File Exchange category templates for your categories. The category templates will include the "item specifics" fields for your chosen categories (sort your basic template by category to make this easier). In many cases, related categories will have similar fields, and you can always return to your listings later and provide the item specifics, either manually or through a File Exchange revision. If the item specifics are not included in your listings, your listings may not appear in search.
To help with testing, an alternative to the Action verb "Add" is a verb called "VerifyAdd". This allows you to test your uploads without actually listing any items. It's a better method for running through all the error messages and for adding and testing more columns for your item specifics as you work your way through the required fields. The uploads will still count against your daily 5K row limit, but will allow you to test without worrying about listing any items during the learning phase. When all the errors are addressed, you can change the verb to "Add" and confidently upload your listings.
What error messages are you receiving now?
As you resolve past errors, File Exchange will get to the next error.
