There is sooo much to learn, I totally understand how it can be overwhelming at first.
SoapCalc is a good option, but I prefer Soapee. I think it has a nicer user interface and it can come in handy for tinkering because it shows your recipe results all on the same page.
There are a few different ways to calculate how much water to put in your recipe. The default is "Water as % of oils" and actually most of us don't use that option. We find that we get more consistent results with "Lye Concentration" or "Water:Lye Ratio". I like to use "Lye Concentration". So if you set that to 25%, you will have a 25% lye and 75% water solution. Most of us like to use a Lye Concentration of 30-35% for most balanced recipes.
Your basic goal with using a
soap calculator is to a.) determine how much soap batter to make to properly fill your mold and b.) the correct amount of lye to use.
So with Soapee, here is what I'd do.
1. Choose "Solid Soap" - because that's what you're making!
2. Select recipe units of measure - Percentage is your oil recipe. Then you can choose if you want to use grams or ounces - grams are usually more accurate on your kitchen scale. "Adjust oil weights to include water in Oils total" - this feature helps you make sure your final batter amount will be the correct size for your mold. So if your mold holds 500g, check the box and put 500g in your "Oils total".
3. Amount of water in recipe - I'd suggest 30% Lye Concentration as a good starting point.
4. 5% superfat is a good start. It means that you will have some excess oils left over after your soap is done curing to make it a bit more gentle on skin and make sure there is no excess lye in your final product.
5. If you're not using fragrances, leave it blank. Otherwise 3% is fine.
6. Select your oils! Choose from the list and use the small + button to add them to your recipe. Then when "Recipe Oils" pops up, add your percentage. A good starter recipe might be 50% Lard, 25% Olive Oil, 20% Coconut Oil, 5% Castor Oil.
After you've entered all your recipe oil percentages, you can scroll down to see that Soapee has generated your recipe for you! It will tell you, in grams, how much of each oil to use. And how much water and lye to use. Double check the "Total Batch Weight" to make sure its the right amount for your mold. If not, you can tinker with Step 2 more.
Just print off the sheet and bring it into the kitchen with you, and cross off each item as you add it.
Follow some Soap Queen videos on good practices on how to combine your oils and lye solution safely and ideal temperatures. Good luck!