Carefully editing ini files for KissAssist will quickly become your favorite part of this hobby! I love it!
If you need a hand seeing what your characters offer, check out
https://www.raidloot.com/class. You can pick a class and level, it will list everything you should have at your disposal if you are current on spells, abilities, and AA. Its an invaluable resource for KissAssist and MuleAssist ini creation. If you need to know what stacks with what or have additional spell/ability inquiries, allakhazam's and lucy can set you straight.
Additionally, there will come a time when you want something to happen based upon specific criteria and you'll dive deep into the wonderful world of conditions! I always have the RG Wiki for TLOs up myself as I am always tinkering with conditions:
https://www.redguides.com/docs/tlos/.
Don't forget to check out the resource section of RedGuides to take a peek at others ini files for inspiration.
After you set yourself up and running smoothly, check out EQLogParser so you can get some telemetry to see how you did and where you need more time in the lab tinkering with your inis.
As always, this community is amazing and is at the ready for a quick question. Good luck!