To create your own custom objects, use structs.
Something like...

typedef struct
{
int XVEL;
int YVEL;
int ZVEL;
string* model;
} ball;

Then create them like so...

ball my_ball;

my_ball.XVEL = 15;
my.ball.model = "sphere.mdl";

Hope you get the idea. When lite-c supports classes it should be easier.