So, I'm not sure what comes in a starter but really if you are brand new and never really done any sort of painting - for your first bubs, the easiest thing is to make sure you have at least the pre-mix colours...(If you are an artist prior and know how to mix colours then go for all your primary colours and add things like burnt umber, ochre, Quinacridone Crimon etc..) BUT if you don't know how to mix colour, it is easiest to use the premix till you get comfortable (I would suggest that you stay away from the warm blush though...lol) so...Baby Flesh, Creases, Veins, Lip/blush, Nails, eyelid purple, eye brow brown and I would add Flesh 08 - those are good colours for beginners to start with- mostly you will just add thinner to the colours and they are ready to use - as you learn and get more brave with using colour, you will start mixing your own after awhile...(you will learn about neutralizing washes as you go but if you have a BB kit, they have nice vinyl that needs very little to no prep work on many of their kits...)
So your paints (as mentioned above)
Thinner - I use slow dry as it gives you time to get all your paint right..If you use a fast dry thinner, you have to be quick and careful that you get it right the first time round because once it dries, if you try to go back and correct something, you will take the paint off and it is difficult to 'patch' it up.
Brushes - I would suggest starting with
4 - 3/8" (small enough and great for mopping creases and keeping them nice an blended some larger Mop brushes can be too bulky to get into some of the tighter areas
2 - 1/2" - great for all round blending in larger areas
1 - 1" mop - perfect for blending out edges of blushing on face, sides of feet, hands, etc to soften it and blend your colours
1 or 2 - Filbert - perfect for lips and nail beds, etc
2 - #1 Round - great for creases, adding thin skin, getting inside mouth an nostrils, etc
2 to 4 - 20/0 Liners - perfect for brows, veins, nail tips, etc
Cosmetic wedges - make sure they are the nice dense firm ones...some you get from the shops are too porous and just swell up terribly - they waste your paint and you don't have good control. You will want quite a few of these as you need to pounce Flesh tones, Blushing and Varnishes...some you will pinch out holes, or make irregular etc for your mottling and flesh layers and some you will leave smooth etc...here are examples of several different sponges for different effects
this one is great for applying flesh layers
This is just one mottling sponge - you can tear out chunks as large or small as you like an they don't need to be uniform - probably better if they aren't.. I use this at the edges of my blushing as well...
Regular smooth sponges can be used for flesh, blushing and varnishes.
Varnishes - would suggest Satin and Matte varnishes and mix them at least 40/60 in favour of matte or some ladies mix them 50/50 - sort of depends in the finish you want..
Paper Glaze - this is perfect for giving wet look to the inside of nostrils, corners of the eyes, lips, nails etc...(doubles as a sealer as well.)
Other things that are nice to have on hand as tools are toothpicks, popsicle sticks, q-tips...
Toothpicks - great for scraping any puddles you may accidentally leave between fingers, creases, etc. perfect for using to apply glue to the eye lids to apply lashes and pushing lashes into place, etc
Popsicle sticks - great for applying E6000 glue to seal eye sockets, can be used to place magnets inside the head for pacifiers, perfect if you have to push a bit of fibrefill up in behind an eyeball inside the socket if the eye is not sitting flush against the vinyl, etc...
Q-tips - well they are great stand by small 'mop up' jobs...
So you should have your Kit, Body, Fibrefill, Glass beads, Weighting Sacks (usually nice nylon panty hose that you will use doubled or tripled to hold your beads, Plugs and Neck Ring (unless you improvise and use something else to seal off your limbs.)
You will also need:
E6000 glue to seal eye sockets, glue in magnets, etc
Mod Podge or compatible Water proof glue to glue in hair if you are going to root hair
Tacky glue or compatible to glue on lashes if you are doing an open eyed doll and are not rooting the lashes
Cable ties are always great to have extras on hand in case you have to take the baby apart and re assemble.
Also little extras like Baby scent to make your baby smell baby fresh and things like that..
Most of the the absolute essentials should be in your starter kit but if you are going to be making lots of babies you may want to stock up on a few little extras to make it even more fun...