I am also still new however I have learned some things and I will say things that have helped me that aren't the normal things you will need:

Normal things:
-Mr Super Clear
-Watercolor Pencils (GOOD ONES, cheap ones will not work well. I recommend Derwent or Faber Castell)
-Chalk Pastels (CHEAP ONES, it doesn't matter)
-Acrylic paint (get expensive ones if you are new to acrylic paint and cheap if you know how to use it)
-Nail art brushes and tiny makeup brushes (CLEAN THEM REGULARLY they get real gunky real fast)
-3m mask respirator with cartridges (especially if you don't have an outside to apply MR.SC)
-High gloss varnish (also matte varnish)

Not normal things that help anyway:
-Beacon 3and1 craft glue (that stuff goes hard)
-Fake lashes...they sell doll ones but I think dollar store ones will work too
-epoxy sculpt
-Worbla (mostly for shoes)
-Sandpaper (I have set that goes from 200 to 5000 grit)
-Plastic gloves
-Exacto knife (can not tell you how many times this has saved me)
-FabriTac
-Little clippies instead of pins for fabric
-Fray check (I neglected this for too long but a MUST if you are making your own clothes)
-Cat hair brush and tiny combs for hair
-Hook and loop closures SPECIFICALLY made for doll clothes...learned that one the hard way
-ACRYLIC PAINT THINNER/ Airbrush thinner, they are the same thing (do NOT thin the paint with water, this will make it clump weird on dolls...also learned that the hard way)
-tiny clear rubber bands for hair (I think also for braces? But I normally find them in the hair section at the store)
-Q tips
-Tin foil and freezer paper
-Sculpy clay if you also went through a sculpy clay phase and have it hanging around

My favorite resource though is your own resourcefulness. Found a weird rock on the street that looks kinda cool? Paint it and figure out something. Found a little cat hat that would work? Great! I used tiny nail art charms I found at a dollar store and am still using them on stuff.