When deciding to leave a job you can face a lot of challenges with your current position, family income, and uncertainty of your upcoming business. This can be very stressful, but at the same time it is worth considering.
You should look at your current job situation and what type of exit strategies that you have in place for your future business. You should be open with your company that you would want to eventually leave, but you need to protect yourself legally against any non competes or non disclosures that you may have signed.
Follow that up with considering your family situation. What will it mean to your family as far as housing and food if you leave your job? Will you be able to protect them and will you be too stressful that even if you had more time it will not be enjoyed, or is your current job too much for you to handle at the moment.
Consider the business that you have ahead of you and the business plan that you put together. Each person needs to have a strong business plan where they can see how the product is created, how it is marketed to a target audience, who is that target audience, and how can you fulfill it for them. If you can't see this then it will be difficult.
Next make sure you can fund your company with the necessary capital. Whether that is from you or that is from some venture capitalists make sure that you are spending it wisely in the areas where you are going to make the most money that you can. Also make sure that if it is from an investor that you have it all figured out in writing before you move forward.
If you have business associates that you are going to partner up with make sure that they are 100% committed. Also make sure that they will provide you with value and support to get people what they want. If they are not going to add value to your business then you might want to consider someone else or that is an extra mouth to feed.
Next I would consider your own personal feelings and what you want out of your business. You need to make sure that by leaving this job and starting a business that you are going to be happier and passionate about it. You will then have a requirement to your customers to provide them with value and that only happens if you are passionate about it.
Well this a way for you to get started and figure out if now is the time to move on or not. Whether you leave your job or not, make sure to get some type of business going on the side. You can't trust company retirement plans.