"video on questfights"? I'm not sure what you are pertaining to here...
If you are looking for a sequence of island jumps to complete all quests, check out this link:
http://forum.1cpublishing.eu/showthread.php?t=14756
Basically if you follow this sequence of island jumps and you get to talk to all npcs necessary for quests then you get to solve all quests. This is for AP though; new quests were added in KBCW.
If you are puzzled by how some fights are done, that is a different matter altogether. For example, in KBAP in Bolo you just need to get the 2nd stone from there; no quests require you to go back to Bolo. As such, just kill everything in Bolo when you first go there (Debir --> Scarlet --> Bolo).
R-14 Gromozeka is arguably the toughest fight there, so you need some serious firepower if you want to do that no-loss early in the game. See attached screenshot of my impossible warrior game battle with R-14. See the red dragon and black dragon? Two Call Colossus scrolls, dug up by the pet dragon in the Debir and Scarlet fights. If you don't mind losses, then it is not so hard, you don't need dragons. Just use a full 5-slot army with good magic resistance (R-14 throws Lightning spells) and does magic damage (R-14's droid units are 50% vulnerable to magic); archmages come to mind here.