Well I assume that your object has a position stored

in a vector:

Vector3 Position;

or in a matrix (where the translation part describes the position):

Matrix44 ObjMatrix;

Either way, to move your object into a direction, you'll need a "direction vector".

Vector3 Direction;

So, for an example, let's set the direction vector to point towards the z-axis.

Direction.Set(0,0,1);

And for every object update everyframe you'll add the Direction to the Position like:

Position += Direction;

(or use a matrix translation with the Matrix).

Now, your object is moving along the z-axis.

Cheers

Wow, you've a long road ahead of you :)


Keep at it though.



Another way of thinking of it is to pick the place you ultimately want the object to go to, and subtract that position from your current. (As vectors). Then 'normalize' this vector (google it), and this becomes your direction vector aiming towards that location.