Starting an IT business in the UK young

As the title suggests, I am in my early twenties and hold a degree in computer science. I have been a technical engineer for the last year, primarily dealing with business networking. During my work, I have noticed that many businesses do not have an IT company or person that they rely on for IT support.

I want to start my own IT company at a young age so that I can make mistakes now and learn from them, rather than waiting until my thirties. I believe that I can achieve this by:

• Creating a website
• Advertising on social media
• Emailing local businesses
• Visiting them in person

I plan to do this while working a full-time job. I know I need to get business insurance to protect myself and my clients. Any suggestions or advice would be great. ( This would be a side project alongside working full-time with the website hosting etc costing around £40 to create it all.)