It's typical to not receive compensation till the company is profitable and or funded.
Typically a 50/50 split is recommended between the technical and marketing/idea guy co-founder straight away.
You'll both have to do lots of work to make this a success.
It's risky for both of you to end up putting in a lot of work and end up with a cofounder not holding up their end of the bargain.
I'd recommend setting up the 50/50 split up front and then have a clause that if either of you are not actively working on building the company they surrender 50% of your share to use that equity to plug in a new marketing/dev person to pick up the slack.
It's all in the execution, hard work to make this a success. If you and your co-founder don't trust each other at this point it might be a sign he'll be hard to work with. Typically this early it's all roses and excitement. Maybe you are just getting to know each other though. The ventures I've set off on I typically go with a 50/50 or 51/49 split from the start.
As far as family goes. I expect you're keeping your good full time job and doing this on nights and weekends. Make sure you document that all development is done on your free time and that there aren't any clauses in your contract that would lead your company to believe they own any development you do on your own time. You don't have to alert them to what you are doing but it might be a good time to read anything you've signed.
Remember Ideas are the easy part and make sure this is a good idea that you want to spend a few months seeing your family less to invest your time in.
Remember keep your MVP simple, just develop the minimum amount possible so it's providing 'value' to signups. If the two of you can manually do steps/processes behind the scenes initially do that, automate processes later once you're growing and scaling.
Check out StartUpsForTheRestOfUs.com lots of great information relating to your situation and startups in general.
Good luck in 2015.