Snakes are the worst. I spent ages building a fence with 5 phlegm because I got so sick of random snake drive-bys

Though good info is that they can't enter shallow water! Run to the nearest river and just dip your toes in the water, then follow the river until you lose aggro.
Hunting crickets? Definitely not 5 B / YB. I was very surprised to see how easy it is for them to piss on my corpse

and equally surprised to notice they're quite a bit more resilient than rabbits(4 - 5 punches as opposed to 2)
At 10-ish humours and some amount of skill you'll rarely have to worry, unless you try to kill several in quick succession. I don't know if you've read the guide detailing this, but the best way to hunt animals is to get aggro with a slingshot, move away and then hit the animal as it heads towards you. It will then run about a bit, during this period you run away from them: that way you can easily see when it stops faffing around and starts chasing you again. Rinse and repeat until you get sweet sweet animal corpses.
EDIT: almost forgot. Don't underestimate the use of Guard! It lowers the amount of frontal damage you take, and with only 10 Blood you'll want all the damage reduction you can get
Slots are for artificing, which means adding an artifact to your clothing. I don't understand it very well tbh, but I doubt you'll have to worry about it for a while yet! Slotting typically gives you bonuses to offence or defence, and the number (eg 30-0) is the range of success chance: high numbers are hard, low numbers are easy. So if there is an item with difficulty 65-50 it'll be very hard to slot. These numbers
are affected by your proficiencies however. I believe the hardcore PvP players have fully slotted gear to maximise their damage