How I approach it is to roughly map out the features it will need e.g. database, backend logic, UI etc. Then I'd think about whether or not I can achieve that w

How I approach it is to roughly map out the features it will need e.g. database, backend logic, UI etc. Then I'd think about whether or not I can achieve that with a stack I know e.g. Laravel/Vue.js. If not, I'd isolate the tricky parts and research what tools I'll probably need. Rinse and repeat until the right stack is settled on. Then start building a rough draft.