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Hi Kieran. You may want to take a look at the post "Minimum Viable Party" from earlier this morning. There is some overlap in my suggestions here.
In short, get a bigger case. You will want and need it in the long run. Think long term and not based on your current proposed idea and budget. All of that will go out the window when you buy a few modules to start with. There are a few other threads in this forum about the folly of trying to do a tiny modular build despite the current wave of YouTube videos. I would recommend you read through those threads pretty carefully before buying a tiny palette case.
If you want specific module guidance, let us know. Lots of folks here will be glad to help.
Have fun and good luck!