In order to get Jacob's loyalty mission, you should go ahead and talk to him about himself at least once. I believe his mission should be available right after the attack on Horizon along with Miranda's.

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Just go through a mass relay and head on over to the marked system. You will need fuel to there, which actually might be a first if you are just following my guide. So buy some fuel from the depot and go on over to the crash site.
You need to scan for the site. Just follow the little white line and listen for the signal to get clearer. Once you're close, a white dot will appear. Hit the white dot with a probe and then land.
You'll end up next to the crashed ship. Go ahead up to the wreck and listen to some logs. You can cross the bridge and get onto the ship but EDI's wrong. There are no resources onboard except a PDA you can hack.
Before you go you need to talk to the beacon itself for some basic info. It seems that Jacob's father is the new captain and that a whole lot of people lost the majority of their brain functions. Move out to the crates and you'll be stopped by a confused woman. While she's talking you should notice a few men moving up and lining up a shot. The paragon interrupt saves the woman. Note that there doesn't appear to be a renegade award for letting her die, so I'm not sure why you wouldn't save her.
Regardless, shoot the group of hunters. They don't have armor and they aren't using good weapons. Just aim for the head and bring them down. Advance up and go to the next camp.