I wouldn't recommend getting advice on approaches for doing a meta-analysis from replies on reddit. There's lots of resources available for how to conduct this kind of research, so best to start there - see this paper as a very basic starting point. There's well-established protocols for how to approach a meta-analysis which need to be researched before you jump into the analysis. Even before the meta-analysis, you'll need to perform a systematic review of the literature where you'll select the papers which will be used in the meta-analysis.
You'll need to learn how to conduct a systematic review and meta-analysis in a methodologically appropriate way, and luckily there's plenty of resources out there to learn how to do that. If your university doesn't offer systematic review training, there's courses out there - example. There's also plenty of free introductory lectures on YouTube which will be worth looking into. Basically, I would make sure you fully understand the concepts behind systematic reviews before even thinking about data analysis - it'll make the actual research & analysis part a lot smoother.
and a very basic tip: use a reference manager (e.g. Mendeley, EndNote), it's essential!