and how do you convince the investors that your idea is worth of the money? prepare a demo, a presentation, a prototype...
If you have 0 network. Then you need to go to conventions and startup meetups and build a network
Some EU governments have startup grants that can help you on the way. But you can't apply as a one man show. Minimum 3
The presentation and demo is usually just an after formality.
People invest in people, and buy ideas