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How to see all Function(s) exported by DLL?

MS provides you a Classic tool namely Dependency Walker (Depends.exe) which show you all the function exported by the particular DLL. Now what if your DLL shows only four functions like DllCanUnloadNow, DllGetClassObject, DllRegisterServer and DllUnregisterServer which signifies that it is COM DLL. You can use another tool provided by MS namely OleView which will show you the all interface associated with this COM DLL.

On other note, using Dependency Walker gives you Function Arguments in mangled form if exported by using _declspec, you can see original parameter list using UndName.exe

How to dynamically load function from any DLL?

For Dynamically loading Function from the DLL you have to take services of two api :- LoadLibrary and GetProcAddress

Here A Small code that will demonstrate dynamically loading of function from DLL.here,
I will load mciSendString function defined in WINMM.DLL .

// first make Function pointer
typedef MCIERROR (WINAPI * MCISENDSTRING)(
LPCTSTR lpszCommand,
LPTSTR lpszReturnString,
UINT cchReturn,
HANDLE hwndCallback
);

/// In function where you want to use about api
MCISENDSTRING fnmciSendString=NULL;
HMODULE hLibrary;

// load the library
hLibrary=LoadLibrary(_T("winmm.dll"));

// check is library loaded
if(hLibrary)
{
// if yes try to get Function addressfnmciSendString=(MCISENDSTRING)::GetProcAddress(_T("mciSendString"));
}

// check is we got Function Pointer
if(fnmciSendString)
{
// if yes call function
(fnmciSendString)(......);
}