You have to really know the business you are trying to break into and make your goals really attainable. Think in terms of figuring out how to generate even enough to pay your phone bill each month, then move up to a car payment, then to a mortgage. Build in micro-steps, making sure that you have stability at each level before you move up. Can you do parts of the business without building anything, IE: via spreadsheet or email, or a simple Wordpress site rather than something more elaborate? Partners are complicated - on one hand they lift the burden of doing it all yourself, but now you have a business relationship to manage; there's got to be a lot of trust there.
On the other hand - there's never a good time to do anything. There will always be a reason why now isn't the right time to pursue whatever you are considering. And, your spouse matters a lot. Whether they are supportive of who you are and what you want to pursue in life is one of the key ingredients of potential success. I'm not suggesting you trade one for the other, but you'll need to be very candid with each other about your goals and needs. Don't try to parent and spouse and career at the same time - dedicate time to each and be very clear with each other about which "mode" you are in, IE: spend Saturday completely with the family. Make sure you are supporting your spouse and their career / personal needs, but also set a rule 5-10 M-W-F is your business time (IE: whatever it is that works for your life schedule and needs)