Hi there,
Yes, Start with the schematic, Modify that first the rest will percolate down. Board layout and connectors and component positions second to last. Use the LSC parts catalog when possible. Turn on and off layers to see your way around. Auto route after you have everything connected, position your connectors and parts , then turn it loose. (look at the DRC and make any adjustments to fit your new layout)
It’s a small learning curve, that board is a little more intense but you can start with an easier board too. Just open New project and CUT and PASTe the circuits you want to add, Ie.I lassoed the RTC and added it to mi design.
HTH
GL 
PJ