SST charts, get em and learn what the temp zones mean in your area. Head down to the local game fishing outfit where you plan to go out and buy some beers for the locals - it will save you 10 fold in fuel burn...
The other bit is if you have commercial around that are happy to yap ask them - they are usually OK with giving out the good oil on where things are at and where the fish are holding.
The bits about tackle etc are pretty much internet research, the other bit I would say is learn how to handle Tuna on the boat because it's gutting to get one and then find it's only good as bait when you get it to shore. A lot of the people who do game fishing compromise their fish to get it over the scales, if you look at what the commercial people do as soon as they can it's opened up, guts out, packed with ice, into chilling environment and the skin protected from direct contact with freezing surfaces. Can't do that in a trailer boat, but you can do a lot if you are prepared as much as you can be.
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