How do I start / which software to use? I'm on my Samsung Galaxy A15 for reference.

Hey car designers, I want to get into car design, starting with making new specs of existing cars and maybe getting onto my own designs. Please answer my questions if possible! thanks.

1. Which software do I use?

2. Should I get a laptop to make it easier?

3. How would I design my own parts to put onto cars, eg. for bodykits - designing a bumper?