I agree with Shari -- make only a 1 pound batch. Better at this point to make modest size batches more often rather than huge batches that you may or may not like. Practice with many smaller batches to gain the skills you need to do this well.
Here's a tutorial about using Soapcalc to make a soap recipe:
https://www.soapmakingforum.com/threads/how-to-use-soap-calc-tutorial.49627/
To create a recipe, first read the tutorial to get familiar with Soapcalc. Got to the Soapcalc website at
http://soapcalc.net/calc/SoapCalcWP.asp Here are my suggestions for the settings you might want to use for a 100% lard soap --
Sections 1-4:
NaOH is the alkali you want to use
Choose ounces or grams for the units of weight
Enter the weight of fats you want to use. If you are using ounces, enter 16. If using grams, type 500.
Click the button by Lye Concentration and enter 33%
Leave the superfat at 5%
Ignore the fragrance entry
Section 5:
Scroll down the list of fats and find "Lard, Pig Tallow."
Double click on that name to enter it into your recipe.
Section 6
Enter 100% to the right of "Lard"
Section 7
Click "Calculate recipe"
Click "View recipe"