Chartered Accountants (CAs), Tax Return Preparers, Tax Consultants and Certified Tax Professionals are the experts in India who can guide and file returns.

Private Limited Company set-up process typically takes around 10-12 working days. However, it can vary depending on several factors, such as the speed of document submission, verification, and approval from the authorities.

Selection of suitable entity structure for a startup involves considering several factors such as:

1. Business Goals: Define your startup's mission, vision, and objectives.
2. Ownership: Determine the number of owners (sole proprietorship, partnership, or multiple owners).
3. Liability: Consider the level of personal liability protection needed.
4. Taxation: Think about tax implications.
5. Funding: Will you need to raise capital from investors or lenders?
6. Growth Plans: Consider future expansion, mergers, or acquisitions.
7. Compliance: Evaluate the regulatory requirements and compliance burden.
8. Flexibility: Assess the need for flexibility in decision-making and management.

Common business structures for startups:
1. Sole Proprietorship: Simple, low-cost, but offers no liability protection.
2. Partnership: Shared ownership, but partners have personal liability.
3. Limited Liability Partnership (LLP): Combines partnership benefits with liability protection.
4. Private Limited Company: Offers liability protection, tax benefits, and credibility.
5. Limited Liability Company (LLC): Flexible with liability protection.

The Presumptive Taxation Scheme (PTS) offers several benefits to small businesses and professionals:

1. Simplified Accounting: No need to maintain detailed accounts and records.
2. Estimated Income: Tax is calculated on an estimated income, rather than actual profits.
3. Reduced Compliance: No requirement to get accounts audited.
4. Lower Tax Liability: Tax is calculated at a prescribed rate.
5. Exemption from Tax Audit: No requirement to get tax audit done.
6. Easy Calculation: Profit is calculated on a fixed percentage of gross receipts.

No, you cannot obtain two Director Identification Numbers (DIN) for two companies. DIN is a unique identifier assigned to an individual who is a director or proposed to be a director of a company. If you want to be a director in two companies then you can use the same DIN for both companies.