Okay. So there's "spells" and then there's "cantrips". Technically, cantrips are spells, but they're like beginner spells. Actual "Spells" have a spell level - 1st, 2nd, 3rd, etc. Those spells can only be cast a limited number of times per day, because each spell requires you to use a spell slot, and you only have two of those spell slots at 3rd level. Cantrips are much weaker by comparison, but they can be cast as often as you want, because they don't require the expenditure of a spell slot.
Mage Hand will be your bread and butter as a Trickster. Your 3rd level ability "Legerdemain" allows you to make the Mage Hand invisible, and you can use it to disarm traps and pick locks from a safe distance. You can also try to pick someone's pocket from up to 30 feet away! Just be sure to use one of your Expertise slots on your "Sleight of Hand" skill. And since it's a cantrip you can use it as many times as you want.
You also get two other cantrips. I'd suggest one that is fun and one that does damage at range. Minor Illusion is a great choice if you're going for a real trickster type of character. It's nice to have a solid ranged attack handy, so either Fire Bolt or Chill Touch allow you to hit targets from up to 120 feet away, which is helpful.
At 3rd level you also know three 1st level spells. But! You only have two spell slots available each day. So you won't be casting your 1st level spells much. They're more for clutch moments or deep role play experiences. Two of those three need to be either Enchantment or Illusion spells. The third can be from any school. Charm Person and Disguise Self are obvious choices that can help with social encounters, infiltration, spying, etc. Hideous Laughter is a great enchantment spell that will make an enemy fall prone and incapacitated if they fail a Wisdom saving throw. That can give your party a huge advantage in a fight... IF the enemy fails it's saving throw.
For your third 1st level spell, I would strongly recommend Shield. It's a reaction and it can be clutch to save your dang life! If you'd prefer more of a combat spell, then Magic Missile is guaranteed damage that can't miss. Or you could ask your DM about Find Familiar! It's always nice to have a pet.
Good luck, and have fun!
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Tayn of Darkwood. Lvl 10 human Life Cleric of Lathander. Retired.
Ikram Sahir ibn Malik al-Sayyid Ra'ad, Second Son of the House of Ra'ad, Defender of the Burning Sands. Lvl 9 Brass Dragonborn Sorcerer. - **Update** - Ikram, in his quest for power and immortality, made a deal with a devil and has been transformed into a greater Fire Elemental. (See stats in the Homebrew Monster section).
Viktor Gavriil. Lvl 20 White Dragonborn Grave Cleric, of Kurgan the God of Death.
Last time i made an eldritch knight i took find familiar as my bonus spell, and as a rogue i would probably do the same. The familiar just has so many advantages to it, not just for scouting but apparently for presenting another target to enemies to allow you to sneak attack.