If you can't fund your artist to do the first issue of your comic exactly as you have it planned, how about to cut costs? Like drawing it in b/w instead of colou,r or any other related stuff that helps the artist put less hours in the work. You could get to an agreement with him.
I say this because, regardless of you doing Kickstarter, or Patreon, or whatever you decide, you need to start the work and make the people before make the money.
I remember an animation project (I can't remember the name
) that funded the episodes of their story with Kickstarters. Their first Kickstarter didn't achieve the money goal, so they posted what the money they gathered let them do.
So that first episode has some scenes that are just sketches, or just the lineart, but posting it let them reach to more people, and with that they could make it in the Kickstarter for the second episode.
With this I don't mean "do the Kickstarter", I mean use the money you already have wisely.
In the case of comics, this could relate to do a raf webcomic, build audience, and then fund a print version that's all neat and fabulous
Regarding the copyright part:
When you do something like make a printed vers of your work, you should put a copy of the stuff you're going to put in that book in the office that takes charge of that.
Copyright doesn't protect abstract stuff, like ideas. But it can protect that physical expression of your work before it goes through the hands of editors, printers, etc.
It's just a legal proof that it is yours, like have a proof that your house is yours signed before notary.
You still have your rights over the work from the very moment you create it, that's just an irrefutable proof in the eyes of legality and something you can signal to your editor/printer when you send them the work.
"I already put it under copyright so I can send it to you on..."
You don't have to leave the exact final version all edited and marvelous in the office, just the content, and you still can do small changes after, as long as that content doesn't radically change (like change the plot of the story).
Copyright is handled by the gobernment and it's only valid in that country, you should look there (in their site) what you have to do and where to go to register a work.
Still, keep in mind if a big company stole your work, would you have the money to sue them?
It may not be absolutely effective, but nothing is, they're just small measures, like lock your door when you go to sleep, it won't stop a burglar to enter if decided, but it may help in many situations.