Oooh congratulations on your new boys 
Ages? Colours? Coat type? Are they brothers or unrelated bonded (you have been very remiss in the detail 
OK- lots to answer:
I'm not a fan of two level living because the GPs in my life have always been extremely lazy (I had four sows when I was a child who would use a ramp but it was shallow, carpeted and had a solid side , like a bannister. My dad made the cage)
We put a ramp in our Pighouse but they only walked down to the food if they were placed on the level.
Guineas shouldn't go on wet grass, so if we have rain like last night, I'd keep them off it for a day (especially if you have baby pigs, ) they shouldn't get wet bellies.
They will scalp the grass and leave their droppings (which is good fertiliser) so ideally a rub you can move about.
I think in your shoes, I'd put the hutch on a hard surface (patio maybe) so it doesn't sit on wet grass. You can hose it down, and if they don't like walking on stone, you can put newspaper down.
Then get a moveable run (Bunny Business are brilliant)
Food - I only gave one bowl/one water bowl (mine didn't do bottles) and one plate for veg, but as you say, spaced well so they don't squabble.
But , I use big plates - dog bowls (solid and shallow) and plastic picnic plates.
When they get bigger you might need to give them one each , see how they go.
(Though now I have three hogs, when they all cohabit, I might give more plates)
If you scatter food , you'll need to clear it all up so it doesn't go off and attract flies/wasps. They will sometimes take food away to eat in peace.
You can get covers that will protect the whole hutch and run, or you can use tarpaulin or thick plastic. Tarpaulins have those eyelets to thread rope fastenings through, I use tent pegs pushed into grass to secure things .
If you get a run, tent pegs are brilliant (though we need a hammer if the ground is solid ) to secure it. And I use those little plastic fasteners - cable tie things that you pull through the loop on one end and they are ridged so they stay fastened- on the doors (cut them off with nail clippers )
Put a couple of extra bolts on the doors of your hutch too. (foxes, cats)
Cor, that was an essay .
They'll take time to settle down, give them that time.
We got GP1 & GP2 as 1 yo (brothers)
GP3 as a 6 week old
GP4 & GP5 (not related) as 10 month old (sows)
All rescue pigs.
The sows (we got last week) are still lairy but settle nicely for a cuddle. Just nightmares to catch . Usually if we catch GP4 then GP5 (the flighty one) realises she's on her own, so she's catchable.
They have had to cope with huge changes but they have a whole summer of lazing about , and in 3 weeks, they'll officially bond with GP3 (he's been neutered, he's waiting to go sterile)
DH is going to attatch our smaller run (GP3 uses this at the moment) to our Pighouse with a 'catdoor'. They'll have access to grass but only if we open the door.
GPs unlike rabbits who will go out in rain, snow, cold, are more fragile. Usually if it's not nice, they won't venture outside.
Now, you need to build up a stock of cardboard boxes (no staples or sellotape) and Primark bags (take the handles off)