What do you want to know? What are you making?
If you've got a 1 gallon recipe, simply scale up everything with the possible exception of the yeast, I use one level tsp for a gallon and 1 level tbsp for 5 gals.
Otherwise, go for it :thumb:
As the saying goes, 5 gallons takes no longer to make than 1 gallon, and lasts nearly twice as long.