"Salted pork gives a unit back 5 hp and the next healing item (forget name) also gives back 5 hp but costs more gold?"
I believe t he salted pork is to heal your units and the potion is to heal your heroes.
"Why do the premade Sovereigns have weapons like staves they come with that are NOT ones you can purchase at creation , but we have no options for our own created Sovereigns to use those items?"
I assume its because one you create will be more powerful often games give pre-generated heroes slight advantage because they aren't "power-gamed" to max certain things like a player might do.
When I start the game, Janusk (and other heroes) can immediately purchase boots of traveling 1 movement for 10g from my starting city, my sovereign cannot. Why is such a powerful effect available from the start and so cheap? 10 gold???
I've never noticed this since I sit all champs I recruit in towns and leave them there, but while were on the topic why can i wear 25+ amulets of +1 movement = WTF?