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