P2Pool is a decentralized community, there is no dedicated support. You can reach and get help from other miners on IRC channels: #monero-pools and #p2pool-log on Libera.Chat
What are system requirements to run P2Pool?
P2Pool needs 0.5 GB disc space and 2.5 GB RAM to run (0.5 GB RAM in light mode). Add this to monerod requirements if you run both on the same machine.
I have been mining for several hours and still got no rewards?
P2Pool doesn't work exactly like regular pools - there's no "pending balance" here. You need to find a pool share first and then wait for P2Pool to find a Monero block. You'll get a payout to your XMR wallet as soon as a block is found and you have shares in PPLNS window. It can take several days to a week to find a share if your hashrate is low. Type "status" command in P2Pool console or visit P2Pool observer to check your progress.
P2Pool status shows 0 kh/s but I'm mining?
Default P2Pool difficulty is very high. You need to set custom fixed difficulty on your miner rigs to get more accurate stats on P2Pool (this will not change your mining rewards in any way). To set custom fixed difficulty for your miner (for example, 75000), run ./xmrig -o 127.0.0.1:3333 -u x+75000
I get an error "monerod RPC ... is incompatible, update to RPC >= v3.8"