Start by clearly defining your idea and determining whether it solves a real problem or fulfills a market need. Conducting preliminary market research and sketching out a basic prototype can help you assess feasibility and refine your concept. 

While you can begin selling your invention without a patent, it’s generally advisable to secure intellectual property protection before going public. A patent can help prevent others from copying or profiting from your invention without permission. 

The cost varies widely depending on the complexity of the invention, the industry, and your production strategy. Expenses can include design, prototyping, legal fees, manufacturing, marketing, and distribution. It’s important to budget accordingly and explore funding options if needed. 

Yes, many inventors start on their own. However, partnering with professionals in areas like engineering, marketing, and legal can accelerate your progress and improve the quality of your final product. Collaboration can provide fresh perspectives and fill skill gaps. 

Common challenges include securing funding, protecting intellectual property, finding the right manufacturing partners, and effectively marketing the product. Staying persistent, being open to feedback, and learning from setbacks can help overcome these obstacles.