Making a simple game in C !

This is what I got working so far .. next problem is .. I'd like an event when my ship hits an enemy ship .. also .. I'd like a #defined number of enemies on my screen at all times .. I don't know how to do any of the above things .. any example or modifications on my lil thingy are welcome..


#include <stdio.h>
#include <dos.h>
#include <graphics.h>
#include <conio.h>
#include <stdlib.h>
#include <time.h>

#define PAS 20

struct time t;
int keye=250;
int coordX=0;
int coordXe=0;
int coordY=0;
int coordYe=0;
int tmp=0;
int tmp2=0;
int i;

void moveMyShipLeft(void);
void moveMyShipRight(void);
void moveMyShipUp(void);
void moveMyShipDown(void);
void desenMyShip(int, int, int);

void getConflict(int coordX, int coordXe, int coordY, int coordYe){
      int stuffz,stuffy;
      stuffz=coordX;
}

int getSecTime(void){
      gettime(&t);
      return t.ti_hund;
}

int pressedKey(void){
      keye=getch();
      return(keye);
}

void desenEnemyShip(int coordXe, int coordYe, int culoare){
      setfillstyle(1,culoare);
      bar(0+coordXe,0+coordYe,60+coordXe,40+coordYe);
}

void initDefault(void){
}


void desenMyShip(int coordX, int coordY, int culoare){
      setfillstyle(1,culoare);
      bar(coordX,coordY,60+coordX,40+coordY);
      getConflict(coordX,coordY,coordXe,coordYe);
}

void moveMyShip(void){
            if ((keye==75) && coordX > getmaxx()-1023){
                  moveMyShipLeft();
            }
            if ((keye==77) && coordX < getmaxx()-60){
                  moveMyShipRight();
            }
            if ((keye==80) && coordY < getmaxy()-40){
                  moveMyShipUp();
            }
            if ((keye==72) && coordY > getmaxy()-767){
                  moveMyShipDown();
            }
}

void moveEnemyShips(int coordXe, int coordYe, int culoare){
            desenEnemyShip(coordXe,coordYe,0);
            coordYe=coordYe+1;
            desenEnemyShip(coordXe,coordYe,culoare);
            tmp=getSecTime();
}

void initEnamies(void){
}

void moveMyShipLeft(void){
      desenMyShip(coordX,coordY,0);
      coordX=coordX-PAS;
      desenMyShip(coordX,coordY,2);
}
void moveMyShipRight(void){
      desenMyShip(coordX,coordY,0);
      coordX=coordX+PAS;
      desenMyShip(coordX,coordY,3);
}
void moveMyShipUp(void){
      desenMyShip(coordX,coordY,0);
      coordY=coordY+PAS;
      desenMyShip(coordX,coordY,4);
}
void moveMyShipDown(void){
      desenMyShip(coordX,coordY,0);
      coordY=coordY-PAS;
      desenMyShip(coordX,coordY,5);
}

int huge DetectVGA256(void){
      int vid=4;
      return vid;
}

void doGame(void){
            initDefault();
            coordYe = 1000;
      do{
            if (coordYe > 800){
              coordXe = rand() % 1023;
              coordYe = 40;
            }
            if (kbhit()){
                  pressedKey();
                  moveMyShip();
            }
            desenMyShip(coordX,coordY,4);
            if (getSecTime()+10 != tmp+10){
                        desenEnemyShip(coordXe,coordYe-15,0);
                        moveEnemyShips(coordXe,coordYe,12);
                        coordYe=coordYe+15;
                  }
      }while (keye != 27);
}


void main(void){
      int gdriver, gmode, errorcode;
      gdriver = installuserdriver("svga256",DetectVGA256);
      gdriver = DETECT;
      initgraph(&gdriver, &gmode, "..\bgi\svga256.bgi");
      errorcode = graphresult();
      if (errorcode != grOk){
            printf("Graphics error: %s\n", grapherrormsg(errorcode));
            printf("Press any key to halt:");
            getch();
            exit(1);
      }
      doGame();
}