Will the layout be the same for each product being entered, if it's just simple only or if I add grouped as well. I may down the road have more so would it be better to always do grouped too and simple for each one that I enter? Also is it better to add simple first then go back to grouped after you have completed the simple products?
You need to add first simple products and then select all them in a grouped products. But yes you can add more products in group product according to your need.