how I install a ide and compiler ...and from where?

Answer 1

Compilers
Visual C++ compiler for windows
Mingw compiler

G++ compiler Clang compiler linux

DevC++, Codeblocks, Geany, QtCreator, are some good ides

Answer 2

hackide is free and good

Answer 3

personally I use Code::Blocks....it's really good... if you want to try download it free by visiting codeblocks.org