However, as newer players they seem to want a little more guidance and pointing in the right direction. (To that end they befriended an NPC who has been "helpful" but more on that later) 
This is where making several smaller modular encounter areas works well. (I am making the assumption that you are not running an adventure module)
Let's say you need the group to rescue a local villager from a band of goblins. You want them to find the goblins, defeat through combat or parlay the goblin threat, rescue the villager, and go back to reclaim the reward. Encounter 1: camp (3-4 goblins hanging around the campfire at night, convenient note/map on captured or dead goblin) location could be any location, i.e. hillside, forest, swamp. Encounter 2: cave/abandoned building (5-6 goblins spread out through the complex, 3 or 4 rooms, another note/map on goblin)...the note/map is the key piece. It guides the group but the actual location or encounter is just a limited choice.
So if they wander off into the wilds...they come upon a small group of humanoids at their camp. The next step follows the note/map.
The group lingers in town not sure where to go...they catch a glimpse of a small creature watching them but it runs off when noticed...following the creature along the local river to a cave or old abandoned building maybe it's a farm or a guard tower. Find a small lair. The next step follows the note/map.
It may help keep your prep down to a couple of options both could be an hour or two of gameplay. It also creates the illusion of choice for the players. Wander off following some clue from the locals end up at the camp somewhere, someplace outside of town. Ignore clues, get lost in town, pull them in with being watched by a creature to where you need them to go to keep the story going.
A couple of random encounter areas will have the same effect. Group wanders off into the dark, wilds, and ignores the local's plea to rescue the kidnap victim. Holy cow! You just stumbled onto an old shrine...the entrance and surrounding trees are covered with spiderwebs...(pull out small dungeon encounter area 1 or 2 and go on with life)