Nah, it's okay. Since you are working on your own manga, I suggest you first think how many pages you can tolerate drawing in a period of say... a week, and how many characters you want to include.
For a good manga, you want to make one with a good plot, good characters, and good art.
If it's just gag or one-shot I suppose it doesn't really matter but I like good art ^^ and I suppose you still would need a storyline.
Personally I prefer doujinshi since the reliability of the setting and characters are already set and as long as you keep your quality in your art equal, if not better than the manga artists, people will read it.
(btw, I'm replying through my main account ^^ too lazy to log out and in again)