If you look at your favorite recipe that you have made thus far, you will have a good idea of where to start.
What is the "main" oil? How much of that? Start by using that amount of that.
Next, write Coconut Oil 20% and Castor Oil 5%.(You may want to play with these later, but you need to have a place to start.)
What is the next highest amount of oil? Write that down, but don't put an amount yet. Add all the other oils together, and that becomes the amount.
This will give you a good "baseline" soap to compare to the others you have made thus far. Let it cure, and compare it to the others you have made. You need to save a bar or two of each batch you make for those comparisons, and to see how they behave over the long haul.(Do they develop DOS, and how much better do they become down the line?) You may find that you can't live without X ingredient, or that you hate Y amount of that ingredient. But you won't know until you start eliminating some and adding more to others.
Watch the amounts of butters, though, as they can negatively impact your lather.
Also, as tempting as it is right now, no additives like milks, silks, sugars, beer, etc. You need to get the "oils" part of the recipe down before adding those to the mix. Then, once you have a "best" recipe of oils, you can start with those.