Bring the cracked sections together, and then wrap the hose with duct tape a few times. That will last until whenever you can spring for the new hose. If the plugs and wires also haven't ever been changed, that is almost definitely the cause of your problem.
One thing about getting into auto repairs is that most of them will require tools. Those of us who DIY buy whatever we need, becuase we know that cost will be repaid, usually many times over. But it sounds like you're on a tight budget, and it may be tough to buy the parts (plugs, and wires), plus the ratchet, extension, plug socket, and allen wrench (unless you already have some of that stuff). Maybe you can borrow some of the tools from a friend.
It sounds like you and your boyfriend are completely green on this stuff, so I'll ask if either of you have ever replaced a spark plug (on anything)? If you've never tightened down a plug, it's not totally obvious how much torque to apply. This is normally a very simple job, UNLESS you snap off a plug, which could turn this simple job into a nightmare. It would be great to use a torque wrench the first time, but that's even a much bigger initial expense. Plus, our Aveos have deep wells, making threading the plug blind, so cross threading the plug (another nightmare) is more likely than with a thread you can watch. And one other thing about our Aveos is that there will almost definitely be a pool of oil in one or more of the plug wells - again not a big deal if your familiar with that. Bottom line here is that you would be much better off getting a friend who has done this stuff before to help you out. Good luck with it!