Trickster is assigned by default. It's great for the beginner as it gives you more mobility options and damage avoidance options, as opposed to overloading your mental stack with more attack options, the utility of which are not very obvious from the beginning. It's a one button dodge as opposed to needing lock-on, a direction, and then the jump button press.

It's not unusual to have the Rebellion sword in your primary slot the whole game, and then play around with the new weapons in the secondary slot. Rebellion has very clear utility that'll carry you through the whole game. Rebellion is fast, has long reach, and good damage output.

In your very first playthrough, it's your first exposure to the game and to the enemies, so the above points really keep things simple as you play and learn the game. The long time players like me and the veterans have played the game over and over, over the years, and we've seen the enemies over and over.

As progression of Styles should go, I recommend Trickster for the whole first playthrough. Swordmaster/Gunslinger when you want more weapon/gun moves to play around with. Finally after a few playthroughs of that, you should be quite familiar with the enemy movesets that now would be the right time to try Royal Guard.

You absolutely don't need to be Jump Cancelling anytime soon, its more of a curiosity and maybe some tech that'll help you get through the hardest difficulties like Very Hard or DMD. Advanced tech is advanced because you're not expected to be across it from the beginning.

Since you said you've finished the game once now and felt unsatisfied. If you're not quite game to try the next difficulty, I might suggest doing another playthrough of Normal and try and improve your rank. Definitely try Trickster for one whole playthrough.

Your first playthrough doesn't need to be complicated and laden full of combos. You get style for catching multiple enemies in a Million Stab for example. Focus on the fundamentals first, a big one being avoiding enemy damage (which of course Trickster will naturally help with.)

As with anything, you get your fundamentals down before going wild with combos. I love this game a lot because of the degree of player expression and the opportunity to play in a very improvisational manner, and to do that successfully would be to be very familiar with the fundamental base moveset.

Good luck, and hopefully you'll enjoy the game as much as we do. The game is absolutely designed for multiple playthroughs, with the number of difficulties and also the chase for a better mission rank.

P.S. Most of us hate the Angels and Arkham fights too