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Total newbie here but seeing new Irish bands would be great.

You can get Reaper for free. Its a DAW or recording program. And youll need an audio interface. Pretty much any cheapish 2 channel interface would do what you want. These are great https://www.thomann.de/ie/focusrite_scarlett_solo_2nd_gen.htm
But anything in the 50 - 100 euro range with two inputs will do essentially the same thing at the same quality. You can just plug the guitar into it and use software effects and amp sims. Loads of free ones of those.

Or you can pick up a Shure SM57 microphone if you want to play through a real amp and record it that way. There are cheaper mics available but thats the most commonly used mic worldwide. and its only 100 quid roughly. Heres a cheaper alternative a lot of people like https://www.thomann.de/ie/the_tbone_mb75.htm its sort of a clone of the 57 but its not an exact copy.

Other than that youll want a decent pair of headphones. no need to go crazy but 10 euro tesco own brand wont really cut it for any real recording.

Loads of resources on youtube for learning the basics too.

Just seconding this post. Reaper is great, Focusrite is great, SM57s are great. As an addition to the Focusrite, theres a great Amp simulator called Bias by a company called Positive Grid that sounds great too.