You need a little background in coding and there are many resources on the Web. The total cost of an iOS or Android application development project depends on the scope of the work, the technology used, the resources to use, the time and challenges faced during the development process. For instance, developing for iOS is really all about familiarizing yourself with Xcode. Once you're comfortable there, you can write your app in a wide variety of languages or take a stab at learning Swift.
But you need to know that app development is a hard and long process. I think in your case it will be better to hire app development company with a good reputation like https://solar-digital.com/ . Discuss your needs and further details. Ask for references or review from past clients, about past projects. Also you can find a nice portfolio on their main page. Cheers.