Without leaving your full-time job start developing (part-time) ver 1.0 of one of your idea that has market and can get some revenue (either by ad or subscription etc.). As soon as you start getting revenue you may leave your job and find a loan that has minimum interest rate - on the other side start looking for angel investors to expand your startups. Make sure you do this with minimum debt and maximum chances of revenue starting right away so that just in case if you cant find angel or if your startup doesnt get you the revenue enough to sustain then you're still safe as you can go back to your full time job. Alternatively you can start thinking about increasing your household income by selling stuff on ebay, preparing your other family member to start working (may be part-time), if you have extra space in your house then rent it to earn some money, etc.
