"I've already spoke some possible future corporate clients, all of them found it great and would like to use it after it's ready." If that's the case, then the

"I've already spoke some possible future corporate clients, all of them found it great and would like to use it after it's ready." If that's the case, then they should be willing to put their money where their mouth is. Ask them how much they would be willing to pay for a solution like yours and whether they would be willing to pay (even half of) that upfront. If they don't want to, perhaps they don't really need it or are not your real customers. There is nothing that will validate your idea better than pre-paying customers.