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If you funded the original Paypal payment to the seller with a card then it won't go back to your paypal balance.
Once marked as completed it will automatically go back to your card. Paypal say allow 30 days but I have never waited longer than a week for mine, however that depends a lot on what country you are in.
ok then as long as its in the correct currency that the person you are paying accepts it should be used when you next purchase.
Before you click to pay using checkout it should show you what 'funding source' is being used for that payment before you click to pay.
Also is this available in your country?
Click on the profile tab (icon next to log out) > Click on payments third option along on the thick blue band top of page > second down click on update next to your prefered way to pay and put a dot in one of the options listed ie balance.