I guess it would depend upon how competitive the keywords you are looking to rank would be. Going by referring domains alone would not be a good idea, unless you mean powerful referring domains.
It may depend upon your country of origin. Why not speak to them and see what they recommend? There are always alternatives to it, so do your own assessments.
There are many posts here relating to it, just search and you will find what you want. Do not over complicate things, and it is a simple and a straightforward process to build a PBN.
Don't bother going for subscriptions when you start out, you can learn more through this forum than benefit from the various tricky networks aimed at making you spend, spend and spend with them.
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