Not sure where to start Op..is all over the place

In the game you will come across Charms, and Enchantments.
Charms are your typical add "x" to w/e, can be added to weapons/armors at any point of the game and are not removable once placed.
Enchantments are learned off of scrolls and similar to application as early Alchemy. Enchantments
however can be changed out.
Also note that as you find alchemy/enchant scrolls they are "learned" once you visit your local Alchemist/Enchanter
Once you have your Battle Tower, this all gets a lot easier. No more traveling all over to get supplies up.
(plus you have runners for ingredients)
Don't also forget to disenchant items you don't need BEFORE you sell them, you learn to enchantment that way as well. Also it does not lower the sell price.
...about the Rentals guy on the bridges..No connection to the Battle Tower. I actually turned him down 4-5 times. Donno, maybe some items or something to get, but I never bothered.
good hunting