Hi Aussie
Wecome to the wierd, wonderful and most of all stressful world of OFP editing ;D
If u are talking about just placing 2 objects together on the map and they end up apart (which i assume u are because u said u are new) then have you tried zooming the map in? Use the mouse wheel to zoom in and out!!
Other than that i can't think what the problem is....explain in more detail if that is the case
I'd recomend heading over to the editors depot, they have got some great tutorials u should read....i found Johan Gustavson's editing tute and Abuu's guide to editing the most helpful when first starting out....check 'em out!!
Happy editing!! ;D