I wasted ton of time in wondering about these things when I was making something just two years back, and eventually, I realised how less it would've mattered.
If you're concerned about taking money, just figure out how to get attention and have conversations with your target customers. When you notice your customers are getting frustrated that they can't give you money for this thing you have that they neeeeeeeeeeed, then do whatever they need to make it work.
Since most side projects fail, consider waiting until you are actually generating revenue.
If your business incurs significant liability that you are worried about, incorporating may make sense sooner.