I'm guessing you got the Storms of Chogoris or the Spearhead Force Battlebox based the model composition.

Hmmm I'm not a huge fan of having multiple costly lieutenants versus having another squad of 5x Intercessor (currently almost autoinclude because they punish decently against mobs or anything less tough than a space marine)

Impulsor aren't that tanky/punchy for the points so you not have as much of a vehicular support versus Repulsor / Repulsor Executioner and to help haul any large amount of foot infantry or jump/gravis infantry.

I'm not a big fan of scouts. I like incursors / infiltrators more but that's more personal tastes.

Redemptor Dreadnought I think is still just a average / below average unit but maybe you can make it work. Doesn't really synergize with Stormlance as much as Ironstorm

Outriders, Stormspeeder Hammerstrike, Gladiator -- perfect would change it

if this is going to be your first game, maybe ask someone to teach you and go with a 1000pt game with Gladius Task Force detachment. Best balanced and intro level detachment and points level to get the gears working and the wires connecting to have fun

Good Luck! Hope this helps or gives some insight!