So, what do other spouses/partners do while they are waiting for applications to process or gaining common law status? As far as i Know there are no other options but to do nothing.
It is hard for any relationship to stay afloat when one person is completely unable to work/contribute; tension and resentments can develop quite easily. Given your ages, how long he is going to be unable to work, the fact that you guys have only met once and never actually lived together (or, I'm assuming, lived with anyone in a partner relationship) and the fact that you will be living with your parents, it will likely be an uphill battle to keep the relationship going.
I suggest the two of you look for an alternative situation, such as doing working holidays in countries like Australia or NZ. This would allow you both the ability to work while really getting to know each other (and yes, you will be actually getting to know each other when you start living together). You would still be establishing common-law, if that is the path that you end up taking.
As said above, sponsorship is a serious commitment. I would say it is even more serious than marriage because you will be signing a legal contract with the Government of Canada to support your partner for 3 years.