I don't know if there is any hard n fast rule for that. It should be big enough to build some curiosity to the reader but not long enough to lose patience

As long as you want. It depends on the length of the entire book.

I don't think if there's any definite length for that. The only thing mandatory is, it's should create a base for the story along with something that excites readers for the upcoming chapters.

I need to know about it can we talk in the inbox

It can be one page as long as it’s the best beginning

More or less 1000 -1500 words, i.e, if it's a chapter not a prologue. In case of web fiction, if you update after a week or twice a week, it's best to update a chapter of about 2000 words or more.

The length of the first chapter of a novel can vary depending on the genre, writing style, and story structure. However, as a general guideline, it's recommended to keep the first chapter relatively short and engaging to capture the reader's attention.Aim for around10-15 pages or2,500-3,500 words for a typical novel. This allows you to introduce the main characters, establish the setting, and set up the central conflict or hook of the story. Remember, the first chapter should create intrigue and make readers want to continue reading.

Ultimately, the most important factor is to ensure that the first chapter effectively engages readers and sets the tone for the rest of the novel.

If you are writing a Novel it can be atleast 10 sheets, A4, Novels are printed in A5 , so it will become about 20 pages

I don't really know

Well, when I start reading a new novel, I realy want the first chapter be brief and laconic. It motivates me to go ahead and continue reading. So, I think it's better to be less than 10 pages.