Hi Pooja,
Your query shows your enthusiasm for the new job.
As an HR Exec...i am not sure what exactly your profile is. But what i generally understand, it would be mainly recruitment and all the activites around it. i.e maybe induction, exits, career planning of the new joinee etc.
In the induction you must have received enough information about the organisation, its working, culture, values, how did it start, its growth, the management team, board of directors, board of advisors.
If you are in recruitment then try to gather as much info of the company as possible. As this will help you to answer the candidates queries fluently and confidently. Learn the strong points about which you can talk easily to sell your company to the prospective candidate. Also know the weakness for your information, so you do not promise anything to the candidate which you can't fulfill at a later stage.
If you have the permission to discuss the offer with the candidate then understand the offer letter and the salary break-up of your org thoroughly so you don't have to back and forth much with the candidate.
In your enthusiasm to start soon on your new job...don't just jump into it, but understand your profile well so you know what is expected of you and if need be spend a couple of days with your senior/reporting manager and understand the working of the org properly.
Whatever you do always be optimistic and positive this will take you places.
I hope this answers your query.
All the best
Rupa.