Formula to Generate Which week of the year it is based on date entered in ""Process Date"" Field.

I'm sorry I'm really new to QuickBase and formulas are one thing I really have a hard time understanding....would each formula above go in my weeks formula field or am I supposed to have the test today field still but rename to "FirstWeek" or something and put the first set of formulas there then the second set under the week formula? Then how do I incorporate the "Process Date" field as the field I am establishing the week for.... Or is the Process Date field supposed to be the "var date TodaysDate= [Process Date];"