Okay, lots of advice, some conflicting.
Let's just reiterate what Sisiutil already knows
Starting locations are special.
While there is a risk you lose out on a resource just outside of your BFC, chances are much greater you lose out on a resource by moving. As somebody said above, there could be two hidden resources, one on either side of your current position. Move, and you might lose one of them without gaining something in return.
The RNG stacks things against making this gamble. Settle in place.
Growth is everything early on.
Unless you find food by settling, go Fishing first. Mining can definitely wait.
If you find two grains, Agriculture is a better bet than Fishing.
If you find pigs OTOH, I'd take the seafood first. Cows or Sheep, not even a contest. By researching Animal Handling, you're effectively saying at Immortal level: "I'm not doing Bronze Working until after Archery" and this is unacceptable with such a forested start.
Your start is heavily forested, you need Bronze Working a.s.a.p; but you need to ensure you can work one or two improved food tiles while researching it.
Early speed-research is a gambit best abandoned at high levels.
Yes, the Silver is nice, but not our most valuable tile. Food is more important.
Once your capital grows to size 3, yes, it would be very nice if a Worker had completed a silver mine the turn before...
Stonehenge is a key asset for Boudica.
By itself, I agree a well-executed Axe Rush is superior to Stonehenge.
But getting +1 happy is huge for a big portion of the game!
Getting +1

+1
in every city for free is a bargain for the cost of Stonehenge. And you (eventually) get a Great Prophet too... It would be criminal to neglect this opportunity.
But should you build it straight away?
No. That would indeed make the cost far too high.
Instead, Stonehenge needs to be chopped. So build a Work Boat and a Worker, explore while researching Bronze Working after a minimum of worker techs, then chop the 'Henge.
If somebody builds it even faster than that, well, then you can always take it from their cold, dead hands.
You should not sacrifice everything to get the SH. But you should definitely not give up on it either. You have a good shot at getting it without having to sacrifice everything else, and this is the best way.
By chopping it, the cost stops at, what, a few Axes. By slow-building it, you sacrifice lots of growth. By not going after it at all, you give up one of the few really good things about your chosen leader.
Then you can chop the rest for an Axe Rush if that's what the map tells you to. Personally, I get the best results from chopping a 2nd, 3rd and 4th Worker (minus any stolen Worker) and then a Settler (lumber supply allowing).
Zapp
PS. And move the Scout out of the BFC. Didn't Corpse establish 1NW is
always best?
