Hey, well I can post a few things if you like. I am by a far stretch no "pro" but I hang around a lot of sculpters and know quite a bit about how to start
lol.
First thing first
1: Tools: You can by dental set tools or the such which I really like, they are very dexterious and easy grip. But you can make your own and you WILL start to get a fav.
Key tools you need a hook pick, a stabbing point one, and a flattening tool the one gamesworkshop makes has a really really small smoothing flat point.
2: Size of the miniature you want to make:
Very Important this will decide what you use. I preffer polymer clay it is a bit expensive but worth it. It is moldable can get smooth and very sharp edges does not dry out or have a time limit, you can bake at 200degree for 10 minutes to give a firm surface and still can scrap off excess if needed and can ad more clay if needed. If you want to work on something small the more firm the better but it is also a lot harder to work with since blending is harder.
3: An Idea:
So if you can draw at all even stick men your good. Simply make a picture of the exact size you want, measure things like arm length "lower and upper" if they are out of purportion your doomed. once drawn even if it is just a couple of circles in the shape you want then your good.
4: Armature:
This is the boned of your model it should go in the CENTER not the actual place your bones should. But if you are going for bones or such obviously you will have to work out where they should go. make sure all measurements are perfect cause any mistakes here will rune it. When measuring the arm length remember the chest width and such, cause that WILL shrink your arms.
5: Start applying clay a very very very thing bit all over the armature avoiding the joints. Once this is done pose your model and make sure everything is perfect "pose wise" then add to the joints. Once the joints are hardened "or baked" your model is ready to sculpt.
6:start the idea:
Start adding things like muscles and such I preffer to over do it and remove as needed. Keep all detail off the model it will look like crap but from a distance will give you the look you want. Then slowly "walk towards it" in theory adding slightly more detail progressing slowly. DO NOT DO ONE
ARM THEN DO THE OTHER. Something about us humans you can never copy something perfect so if you do one then the other it will NEVER look the same.
7: Adding up?
Get your picture of the shape you want place on cardboard and cut it out, hold up the hole in the cardboard to your model and see if it is there or not if not you can remove add exct.
8:final straw:
Now that things are hardened up or baked start slowly adding detail and make sure you know where you can hold the model because you will need to
lol.
9: Basing
this is where you will add the basing or such and work the final work on the feet, foot or other.
10: Start your next one
First will be rough, second not so bad and so on after 5+ years it will be exactly what you want hopefully sooner