This is wonderful!
I’ve been wondering what happened to you
I think you will have to wait for next autumn to start RCIA unless you find a priest who would be willing to instruct you one on one. In that case you could start immediately and be received when he decides you are ready.
In case you are at Edinburgh University I would recommend the dominicans at George square. It is a great place to be and I have fond memories of attending mass there a few years back.
RCIA would cover all aspects of the Catholic faith. It is taught by a priest or lay people (or both). Since you have not been baptised you would be baptised, confirmed and would take communion all on the same day. You would probably be expected to go to confession a few weeks after that.
I found Catholicism for Dummies a really good, informative book. It would be a great source of info during this process.
God bless and best of luck!