How to lay roads...

Hi, this probably sounds really stupid but I'm trying to build my own map and I can't figure out how to place a road. It must be really simple, but I can't figure it out.

I can load splines but how do I then place that on to the map? I tried clicking and dragging on to the map but that doesn't work. I tried double clicking, I tired right clicking... but nothing seems to happen. All I have is a blank map.

The same problem with objects - how do I put an object on to the map when I've selected which one I want?

Thanks in advance for any help!

the unbelievable magic of the button "N" will be with you! just select an object or spline by left clicking, move the mouse into the map, press N (for new), and the piece will "hanging on the cursor". you can pick up the objects again, if you click on them on the map and press G (for grab).