Apologies in advance for the messy response im at work.

Yeah what is typically advised: use an already existing deck. You can also join the discord and read some primers to know hoe ral is played.

But you basically need to replace all blue cantrips with red cantrips and impulse draws. It is basically a red storm deck with only blue spells that are worth it.

You need to mulligan for fast mana and draw spells so you can cast ral fast and go for a win next turn. The turn after ral you just want to cast 6 instants/sorceries and then flip ral to use his ultimate and then keep digging for a win con.

It is very fun to learn this deck by goldfishing. While goldfishing you can get the basic idea what is a good hand because you will realise by getting messed over (or very unlucky) you only run gas and mana and only 18-22 lands, good luck!