I've only had a boy
but can answer a few of your questions.
During the first 2-3 weeks he did occassionally have a little spot of what looked like really watery blood in his nappy...but I'm sure reading my NHS baby book (that they gave me in hospital after having him) that it said it was something to do with his body changing to adapt to life out of the woomb and that it wasn't actually blood and was perfectly normal in first few weeks. He certainly didn't seem upset about it
We had about 5 'fountains' when changing his nappy
This was between 2 & 7 weeks old. We haven't had one for a while now. I believe it's something they grow out of but a lot of women on the forum noticed it seems to happen as soon as the nappy comes off so think its a reaction to the different temperature of air hitting their delicates lol
You can try undoing the nappy so there is a bit of airflow but not actually taking it off straight away, placing a baby wipe over his peepee and cleaning his bum first and that last, OR they even sell things online called tee-pees
It's just a triangle you put over it until you clean that area lol.
You do need to pay extra attention to cleaning under his 'sack' and if he's done an explosive nappy and it's got on his pee-pee just make sure you get it all off and there isn't any got under the skin.
You can use cotton wool and cooled boiled water OR wipes, it's up to you. Personally I found that cotton wool got rid of his tar-ish newborn poos in the first 3week better than wipes but wisps of the cotton wool kept sticking to his 'bits'
So he's been on wipes since about 3 weeks old.
The rules with cleaning aren't quite as strict as girls. You can wipe the bum and sack in any direction you like as it can't get wiped into anywhere by accident (like a girl) but you should always use a seperate wipe/cotton ball for his pee-pee as this is the one area that can get infected.
Hope this helps
We don't do nappy off time over here as hubby stresses out when he has accidents (can never predict where or how far the stuff will go
) so I can't help with that.