easy 3d positioning: help and ideas needed

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Hello,

in my tactical 3d space game, I want to position my space ships by ordering them with a mouse click. On 2D tile maps, it is easy to move and position an object (e.g. left click to select and right click to order the unit to a new position).

But how can I truly position objects in 3d space ? Using a mini map always reduces positioning to 2d (therefore I guess many 3d games are kind of 2d tile positionings).
Do you know any examples for left click / right click positioning in 3d ? Do you have any (also non Blitz3D example of how to coordinate and position movements in 3d space) ?

Thanks for tips
Bernd