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Bundesarbeitsagentur (German Federal Employment agency): https://www.arbeitsagentur.de/jobsuche/
Indeed https://de.indeed.com/
Please keep an eye on the EURES European Job Days that are organized regularly for different countries. Please note, our explanations regarding recognition and visa refer to German law. Each European country has its own rules and regulations.
In the internet you can find sample for both, cover letter and CV. Please note that there are certain standards for the development of both. A cover letter should not be longer than one page, a resume can 2-3 pages long depending on you work experience that needs to be presented in the resume. Your documentation has to be complete, i.e. even if there were time when you were not working, you still have to mention the timeframe.
Helpful tools to develop an application can be found on the website of Europass: https://europass.europa.eu/en