Custom Questions by the Count

[The Count]

Greetings from the Count! If this is the wrong place to post my questions, then tell me where they should go by indicating the correct section of the forum and I'll post them there. Hopefully, some fellow forum members will be able to answer my questions concerning customizing figures.
1 Which of these would be the best sculpting material to get?
Sculptie or Super Sculptie
Magic Sculpt
Magic Smooth
Needotyte
Miliput
Das Pronto
Castilene.

2 What is the difference between the sculpting materials listed above, and which would be best to use based on those differences?
3 Where would I be able to find physically or online any of these sculpting materials?
4 How much would each one of the sculpting materials listed above cost and how much of it should I get?
5 How would one texture pieces made with these sculpting materials?
6 Are there any additional materials I need to get in order to texture pieces made with any of the sculpting materials listed above?
7 If so, then what are they, where can I get them, and how much would they cost?
Please respond ASAP cause I'm interested in getting everything together to work on a few figures during the summer break. Thanks for your help and have
a good day.