Good to see your enthusiasm. However, suggest you to study the prevailing HR system in the firm and then come out with plan to fill the gap.
You will get plenty of posts to guide on 'how to and where to start the HR functions' Please type 'how to start with HR' in the search key. It will help you.
From India, Pune
Secondly, once every process is fully documented, then you can apply for ISO 9001 accreditation. That in effect gives you a sound basis on which to work, and your organisation will be regularly audited to ensure compliance.
From Australia, Melbourne