First server: Buying hardware in a developing country

So I've been googling to find out what to buy for a jellyfin/game server and the problem is almost all posts are about buying hardware in the US or EU. I checked the second hand market and it SUCKS around here, like 10 year old+ CPUs being sold as 'intel i7' for stupid prices.

I've decided to buy new stuff, at least I get warranty. When I searched around for info on that I also got a lot of useless (for me) advice like buying mini pcs that are either not available around here or very expensive. Basically I think I just need to build something myself using non server hardware, is that a bad idea?

What I have in mind right now, please tell me if there is anything that will cause issues later:

• i5-12400 (mainly for the integrated graphics to use jellyfin's hardware transcoding. Is the UHD 730 enough for that?)
• No idea what to get for MB, I usually buy AMD. H610 boards seem cheap enough but very limited on storage options (sometimes only a single pcie slot even), I do want to eventually add lots of storage to it.
• Server quality storage is extremely expensive, not sure if its worth buying. Was think about getting some WD blue 2tb drives, but really not sure here either.
• For case I saw some suggestion for cases with a ton of hotswappable drive bays but sadly I couldnt find any to buy in my country, will probably get whatever cheap one I can find.
• PSU I want to get any gold PSU with low wattage from a reputable brand but its been hard to find 500W or lower here, usually shops only offer brand PSUs that are 650W+.
• 16gb of any decent ram I suppose?

Btw I live in Brazil, if you feel like searching around even tho the websites are in portuguese:
www.kabum.com.br
www.pichau.com.br
www.terabyteshop.com.br

Any help is appreciated, its gonna be my first server so I have no idea what I'm doing