The radio head connector has the power leads you need for RAP (retained accessory power - on until you open the door with key off), and always on. Relay the power if there's a concern about the circuit load. Don't waste time trying to use a key-only solution not relayed by the BCM, as they are much deeper/complicated than necessary, or involve sensitive systems (airbags, etc.).

With the fuse panel "codes", they're usually just abbreviations or acronyms, or sub-series of such. For the others you can try a search engine (google, bing, etc.), or much more reliably, the service/repair manual. Some of them may be in the owner's manual. OR, trial and error-- pull the fuse and see what doesn't work. Please post your results here, either way, if you do.