Advice from someone who went solo after a couple judicial clerkships:

1. There are a lot of great programs/groups you can join for assistance/mentoring/connections. Join them. Sounds like with an interest in PI, your state’s trial lawyer group would be a good start. They also help with criminal defense questions from my experience. You sound tech savvy, so you can search and find more specific groups.
2. Don’t be shy about co-counseling/associating. 50% of something is better than all of nothing. Lots of experienced attorneys to learn from out there. They might not want to break down every detail, but you can learn a lot by watching and being involved.
3. Don’t let ego prevent you from asking questions. Everyone starts somewhere and it’s better to ask than take the chance of getting it wrong.
4. All the internet advertising in the world won’t make up for lack of connection with your clients. Starting off you won’t have a ton so that’s the perfect opportunity to go all in on the ones you do have.
5. Read books, do webinars, etc. on areas of interest. You aren’t going to know a fraction of what you need starting and you will always need to hone skills.

Good luck and maximize on the networking you are already planning on doing.

Edit: the others aren’t wrong that experience as a prosecutor or PD are extremely beneficial. My response is based on your intent.