Seeking advice: To Revenue at Start or not

Hello everyone i have seen that this community is golden and i thought why not try my luck for my blocking thought I am building an online food order app, where i provide only the online ordering through apps. One is for users, who use app to order food and one for restaurants kitchen display orders, one other for the delivery guy. I come from eastern Europe country so food is relatively cheap, good Burgers cost max 2.5 euros and most of good restaurants have their own delivery cars and guys. So i wanna bridge this gap. The problem is pricing should i charge the user per order and also restaurants a small fee per order. I am very pesimistic that restaurants agree to pay me 0.20-0.30euro per order even though i know this app would definitely help them and ease everything Another way is that if i make it FULLY FREE i will definitely get much more users that use it. So maybe later i can benefit from it. or seek investment I am a developer so my only investment is time and hosting approx 50euros per month How would u approach my situation?