THE SHORT ANSWER
No. Entering the Express Entry pool does not guarantee an invitation to apply, and an invitation is not an approval of permanent residence.
What is the difference between eligibility and selection?
Eligibility determines whether you can enter the pool through an eligible program. Selection depends on the requirements of the invitation round. Both questions need to be considered.
Is there one CRS score that guarantees an invitation?
There is no single permanent cutoff for every applicant. Check the official requirements and results for the relevant invitation round, rather than assuming a past cutoff applies to you.
What should I organize first?
Keep your language results, education assessment where needed, and work history organized. Job titles alone do not explain your work: keep accurate descriptions of duties, dates and hours.
Go straight to the source.
Confirm the current instructions with IRCC before applying. These links are official Government of Canada resources.