I'm a 'seeder', creatively. Most of my stories come to me as a small but intense scene, and I have to work forwards and backwards from there to figure out how it came to that moment, and where it's going. It's a style that's very well suited for short fiction, but I don't recommend pantsing it out in any way with web serials; that's how you end up lost in your own words and uncertain of where you're going.
With that in mind:
1) I got over my allergy to plotting and did the work, because it's work that the story needs if it is going to be novel-length. The good news is that your initial plot outline on a major work can be as short as 2-3 pages, but it should grow over time as you flesh it out from an outline to a summary. There's really no way to reliably keep all the important parts of your story in your head and keep a structure in mind without doing SOME of the work here.
2. Yes. I and my co-author start with the basics. Spell check, grammar check, punctuation check. Then we consult our running list of larger, more flagrant style errors. I'm horridly bad in my first drafts, for example, for using semicolons where they don't need to be, and of leaning on the adjectives 'softly' and 'gently'. So co-writer and I keep a list of about 17 items that we do a ctrl-f for through the document, count up the issues, and fix those. Only THEN do we get into the process of *serious* editing: We leave a chapter for a minimum of 2 weeks when we can, and then come back and do a hard, harsh 'cold read'. Once we've done a re-write as we did our cold-read, we then load the story up into a program called 'The Hemingway Editor', which helps automate some things and keeps me from running incredibly long sentences. /THEN/ we publish, and then comes the long promotion checklist: Patreon, Facebook, Twitter, WFG, and the cross-posting method list to sites like Wattpad and RoyalRoadLegend.
If this all sounds like a lot of work... yep, it is. Welcome to the marvelous new world of online self-publishing!
3. Work is "protected" by copyright from the moment of creation. That being said, I'm giving it away for free online to anyone who wants to read it, so I'm not exactly concerned with protecting the IP. The simple fact is, nobody wants to steal my shitty ideas, or yours, or anybody's, and if they actually do, then there's a long online "paper trail" that makes it quite easy to prove in court that the work is mine. Piracy of my work is unwelcome but inevitable, and all I can do is ensure that that work includes links that potentially monetize back to me. Hopefully, anyway.
4. You should revamp, but not for the reasons you're thinking. The style is busy and could use some cleaning up, but the bigger part is the user flow and content. At a glance at your site, I haven't the faintest idea where I should go to actually READ a story there. And with article sideboards like your 'Fuck Bucket List', my first instinct is to sniff, say "Great, some myspace-esque bullshit," and close the browser tab. Your site design, flow, and content, need to all be built around great truth of writing: The Reader Is King, and you're here to serve them. Make sure that, at a *quick* glance, a reader can immediately tell where they need to go to get to the goods. Who you are as an author? They're not ever going to care unless they're hooked on the writing content. So get them reading that. If you're going to monetize, monetize, and make sure a reader never has to ask "Where DO I go to support this person and give them money, anyway?"
Good luck, have fun, write hard, and in the always apt words of novelist Chuck Wendig: "Read books. Do shit. Staple-gun your butthole to the office chair & write like a motherfucker, motherfucker."