As some one who makes novels with more successful novelist friends. Honestly for webnovel its not really necessary to have all that (professional editing, beta/alpha readers, ect). Its only really necessary if you were releasing an E-book on amazon where the standards are higher. Most reader here are young and have English as 2nd language so the perfect grammar spelling are not exactly needed. But if you can afford it it would make cleaning your story up for print quicker and its a neat little bonus. But the bare minimum is your story has to be readable.
The most people publish is one episode 1k-1.5k words a week. Albeit I know one bigger one who publishes 2k-3k every 2 weeks to only once a month (but by the time they did so they already gathered their reader base).
As for word count a day it depends. I personally prefer to have written the whole story before I publish so word count a day doesn't really matter. But regardless its always good to have at least a months worth of episode already pre-written in advance in case you cant write for a period of time