I'm still really bad at using the site finder, so I prepare for every eventuality: no wood, aquifer everywhere, no clay or sand (actually clay and sand I might abandon for, only things I will abandon for, too much of a hassle to import)
So I bring lots of rocks, wood and some copper and tin ore for bronze, or iron ore and marble for steels (cheaper than bars). I usually bring fuel because although wood is cheaper, it is worth the energy spent burning wood into fuel. Then 20 bags of sand (20 free bags at the price of sand, yes please!)
Oh don't forget the most important part DELETE THE FOLLOWING USELESS, EASILY MADE ITEMS:
crutches
splints
bags
ropes
cloth (rob the elves! why do you need cloth the first year? Ok maybe for a mood, so bring 1 of each kind)
I never bring animals, those come free, I bring 20+ spawns and seeds, I bring tons of booze.
I make 2 training wooden axes on site and forge a metal pick or two saving loooads of points.
Points go into making an amazing diagnoser who may also be an adequate doctor and two good soldiers. All other roles are optional (but honestly miner, mason, carpenter, farmer/brewer). Never fishermen (situational), never hunters (suicidal), never socialites (why buy the cow when you get the milk for free and the milk is distracting the chief medical dwarf with parties?)