I’m a web developer and have been doing a lot of freelance work and every now and then I need help to add additional features on my projects (usually ReactJs)

I want to hire other devs for help, especially as I get more projects and need to make different changes to projects I’m maintaining

Lots of different questions - how would the payment structure look like? I usually get paid per project, but if I’m just looking for someone to help with different features here and there - how do I pay them? Pwede ba gcash 😅 kailangan pa ba ng additional paperwork? - do you recommend I just give them access to the whole github/gitlab repo? I’ve heard a lot of conflicting advice on this. - how do I vet a dev to work with? / make sure I’m not getting scammed - How do I make sure the work agreement is clear between me and the dev

Any other tips you can recommend for me?