Assuming your project is imported into Eclipse, this should fix your keystore problem.
double click on AndroidManifest.xml in the project sidebar
scroll down and click on 'Use the Export Wizard to export and sign an APK' (in export expand thinggie)
Select 'Create New Key Store'
type a location for the file (it can be anywhere, a good place is C:\Users\[username]\keystore
make a password, can be anything
click next, make an alias (can be anything, I have 'my keystore')
make a password (at least 6 chars)
set validity to at least 25 years
and type in some of the other info (at least one of them)
you can then export the apk.
Not sure if this will fix your problem but it might
There are 10 types of people, those who understand binary and those who don't
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