Making cosmetics properly?

[jksl 1]

Hi all,

I made a bunch of purchases on makingcosmetics.com

here's what i got

polysorbate-80

zinc oxide (micronized) powder

zinc oxide powder

colloidal oatmeal powder

AS corn starch

l-ascorbic acid powder

magnesium ascorbyl phosphate powder

niacinamide powder

citric acid crystals

liquid licorice extract

Now, all these have different pH and combining them will result in some other pH. Where can i learn how to mix these ingredients properly, find out which ones don't mix well together, figure out what pH i should try to aim for, etc. etc. etc?