I installed TYPO3 (Blank package, version 4.5.16) in http://local.typo3.in/ and FLOW3 using the terminal command in http://local.flow3.in/.
Then I created a new package using FLOW3. Can I access this package from my TYPO3 website?
No, you can't.
TYPO3 before NEOS isn't compatible with FLOW3's packages.