Another good resource is the recent Knowledge podcast about testing: 
New Episode! The Knowledge - Why Fitness Testing Matters - The Knowledge Podcast - SYSTM Forum (wahoofitness.com)
Since you’ve been detrained your numbers might change pretty rapidly. When you do feel up to FF, consider a Half Monty in the same week to give you “fresh” baselines to aim for pacing in the 5 / 20 min–this is something suggested in the podcast linked above. The “Fitness Test Prep” training plan gives you this option.