Test run my sci-fi D&D campaign

So I'm a completely new DM, I've never done this before. I was/am making a sci-fi D&D campaign and i wanna test run it! It has 10 sessions in-total (not counting session 0) I don't really know how long these sessions will take as I've never DM'ed before... 40% of combat is 5E, 60% of combat is homebrew It has quite a few homebrew elements most notable being: A ship customizable with module's that effect its stats. Some monsters thats it i think Oh and this campaign isn't the most serious thing but there are some moments you need to lock in. And there are some roles that me and my friend made, so you can think of what you wanna do (at the bottom) Idk where i need to put the world backstory so ima dump it here: (Ik it isn't much but i'll incorperate your backstory into here as best i can) Nagartah (neptune-ish planet) A quiet ice/water giant, nothing special happens here. It has a history of being invaded, but the invaders often quickly leave after seeing there is nothing of value here, or at least thats what they think. There are some gaint Lithium vains that are of significant value, and propels the very few civilizations that live here to incredible tech levels. Thats also why most cyborgs are from here. Jaguda (juipiter-ish planet) There's not much to say about Jaguda, all there is that giant space station that quite an amount of people live on but thats just it Urath (earth-ish planet) A planet with a huge history, I'd rather not go into all the war-crimes that happened during the countless wars that happened here... But it is the most basic planet so idk Luna (Moon-ish Moon) Its a fu##### moon, what do you want me to write about this place? Only real thing is that there is a treaty to not touch/land/do nything on this planet to preserve its natural beauty? Okay the Urath goverment must be on some Star-high dust like B#### WHAT DO YOU MEAN NATURAL BEAUTY THERE'S NOTHING Idra (-ish Planet) Idra is an extremely cold place that is any miners dream, many ores, soft rock, and big caves! But the surface it pretty much un-livable due to the -120 degree C0 winds. Except a giant group of penguins don't agree with this basic common thought and made a civilization here. While they may have a giant fleet, penguins are clumsy yk? Avonria (-ish Moon) On of the 2 big population centers, while the majority of the population might be in EXTREME poverty. The higher-ups and government are insanely rich and posses the strongest ship known to the universe! One half of the planet is a gaint dessert, and the other one an overrun city. And don't worry, the elites are high above in their space station! Dawntor (-ish Moon) Not a big moon with alot of people, but it is the most uniqe! As this is one of the few places where magic is a normal thing, most people that see this are baffeld and suprised that that is real! So ships/parts from here are often interwoven with magic and this planet is the only way to get shields on a ship. And no I see you reading this, if your born on this plant you automtically get magic skills, even without learning! But for others its quite hard, but possible! Especially when they've spent some time on the planet it-self. Experts say this comes from 3 pillars, but come on, who believes them? CAPTAIN Skills: Wisdom, Intelligence Role: Leader, decision-maker Action (1/turn): Command: Give 1 ally advantage on their next roll Evasive Order: +bonus to dodge for the ship Focus Fire: +bonus to hit for weapons PILOT Skills: Dexterity, Wisdom Role: Movement & dodging Action (1/turn): Dodge: Avoid incoming attack (DEX check) Boost: Reposition ship Risky Maneuver: Big dodge bonus (fail = penalty) GUNNER Skills: Dexterity, Perception Role: Weapons & attacks Action (1/turn): Fire Weapons: Standard attack Aim Shot: Harder roll, more damage Suppress: Lower enemy accuracy ENGINEER Skills: Intelligence, Strength/Dexterity Role: Repairs & system boosts Action (1/turn): Repair Module: Fix damaged system Boost System: Shields ↑ Engines ↑ Weapons ↑ SCANNER / TECH Skills: Intelligence, Perception Role: Information & detection Action (1/turn): Scan Enemy: Reveal weakness Predict Attack: Give ally advantage to dodge Detect Anomaly: Find hidden threats RULES for these role's Each player takes 1 action per turn Captain gives 1 bonus command per turn Engineer chooses repair OR boost (not both) And don't worry, you can switch role's out of combat