Problem about output text in my Personal Project

[applenew]

I am having quite a bit of trouble just getting user input/ or even storing strings, etc. so let me lay out my problem.

Personal Project, so no limits, I do like to know how stuff works though.

Array or Vector
C_Strings, Strings, Char Array;

I understand those are what I have to work with.
I want to make a list of choices for the user, and store them so that I can easily print them out by calling their number.
Also the user will only enter in a number, then the number will correspond to the choice, so therefore I only really need to output all of the options in a timely manner.

 #include <iostream>
#include <vector>
#include <string>
vector<string> user_choices;
void initializeChoices(vector<string>& user_choices);
using namespace std;
int main(){
	initializeChoices(user_choices);
	cout << "Hello, which number would you like to pick?" << endl;
	for (int i = 0; i < 1; i++){
		cout << i << ": " << user_choices[i] << endl;
	}
	return 0;
}
void initializeChoices(vector<string>& user_choices){
	user_choices.push_back("Choice 1");
}

My code so far. I know it is wrong, the compiler went crazy with errors.
Thank's!
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[MiiNiPaa]

Code is fine by the way.

Just a little omission:

std::vector<std::string> user_choices;
void initializeChoices(std::vector<std::string>& user_choices);