If you are planning to publish on Tapas or Webtoon, I would suggest you to do some research of long-form/scrolling format for webcomic, since the traditional black and white, page by page manga format is not as popular on these platforms.
While manga page has 4 to 6 panels on each page, webcomic ony has around 2 or 3 panels each, so if you spread 5 page of manga format to webcomic format, it's quite long. Around 30 panels a month ( 1 panel a day ) is a good speed for starter , but I would suggest you to upload shorter episode and more often ( 7 panels a week or something ), but you might need to change the writing style a bit to make each update interesting enough even when they are short to keep the readers stay.