Create a 700 by 700px document. First, enable the Grid (View > Show Grid) and the Snap to Grid (View > Snap to Grid). Next, you’ll need a grid every 5px. Go to Edit > Preferences > Guides > Grid, enter 5 in the Gridline every box and 1 in the Subdivisions box. You can also open the Info panel (Window > Info) for a live preview with the size and position of your shapes. Do not forget to replace the unit of measurement to pixels from Edit > Preferences > Unit > General. Al these options will significantly increase your work speed.