There is no limit to the number of figures. But usually it is hard to include more than four. Next do the figure captions. The Figure with its Caption should be able to stand on its own. Don't say that important things can be found in the text.
Tables are the next item.
Prepare your equations. Never redefine a symbol. Don't use more than 12 equations. Make a serious estimate of what references you will use. Multiply by 1.40 to account for footnotes and omissions.