There's no imperative need to convert a proprietorship firm to a Pvt. Ltd. Co. to develop your business. Even in a proprietorship firm, you can recruit persons to any post. Nevertheless, converting into a Pvt. Ltd. Co. is the option and discretion of the proprietor, at his or her own will. You can also consider registering it as a partnership firm with a Limited Liability Partnership (LLP) status, taking a few from your own family or friends as your partner(s). Incorporating the firm as a Pvt. Ltd. Co. involves comparatively more procedures, filing of returns, maintenance of records/accounts, and audit. It also requires the role of a Company Secretary, either as a consultant or a full-time incumbent, to manage statutory requirements, shareholding, etc. My suggestion is, for the present, you are well advised to convert it to a partnership firm with LLP status. In due course, considering requirements, you may think of converting it to a Ltd. Co.
A candidate who is either ACA/ACS, MBA(F), or BE/MBA-Fin. with LL.B., possessing in-depth knowledge and experience in corporate affairs and business development, will be an ideal choice.