need recommendation to make sustainable investment in FB ads campaigns

i want to invest 1K $ to make monthly profit (say 80$)
(Taking into consideration that i will read, learn, try new things, fail many times before i find the right formula to success)

this amount of profit is good for me
(Taking into consideration that i live in tier 3 country, and this investment will give me additional profit beside my day Job )

i think to build website with content > put some CPA links > get traffic from paid FB ads

but, i didn't find too much threads here that talking about running FB ads.
many threads are talking about group posting, but as you know: FB algorithms become very smart and Things get more difficult over time .

i`m not seeking for spoon feeding , i just want to hear your recommendations or ideas.

what threads to read ?
is CPA good or it`s better to promote physical product ?
will FB ads leave a profit margin ? or its cost will exceed CPA profits ?
if my idea is bad , what is your suggestion for investing 1k$ ?

thanks in advance to everyone who gives me 5 minutes of his time to replay me.

from the looks of it you want passive income or minimum work.
- CPA is a fulltime job and is only recommended for people who are willing to commit full time to it, it requires a lot of testing and optimization and you will burn through your 1k easily.
- physical product if in a specific niche, yes works, but again it won't be passive income.
- digital product would suit you best, but again all these require you to have a medium knowledge about fb ads.
just having the money and willing to spend it is not enough. to make profit with fb (ads of any type) to become really good at advertising and market research. (Understanding tracking, pixels, optimizations, a/b tests, ad generation, ...)

I would say find your product and niche first, then spend money to test and find a marketing channel that would work best with that product.

ps: I think you are assuming spending 1000$ and earning 80$ is not that much... even in tier 1 countries that's a decent profit margin ( 8% profit ) anybody would love to have that.