I guess you just need to validate the idea, with some small amount of money. For example, buy some neutral domain name, where you could setup landing page for

I guess you just need to validate the idea, with some small amount of money. For example, buy some neutral domain name, where you could setup landing page for your first idea, put 20-30$ on google adwords, bring 1000-2000 visitors to your page, and see if they are interested (by collection their emails). If it fails, put a new page on the same domain, for new idea, again put some money into adwords, and test the next one...