1 per day: If you have just started blogging, then writing consistently might take time. So set a target to have 1 post per day that is well researched.
An interactive style of writing will help you gain readers, but steer clear of SMS lingo if you want to be taken seriously.
Formatting - Your post need not be a circus. If you are not good with formatting, then stick to a theme that is light and descent in colors and the post layout. If you are good with trying new stuff then use that skill to better express through colors, fonts and layouts. Avoid colors that are dark and fonts that are overtly bright.