Brother and I want to go back to the hobby after about 15 years of absence

I have obsessively studied the rulesc, codices, battle reports and so on but I cant quite figure out the army list restrictions. Is this army battle-forged? Can i make Tigurius my
WL and will his special rules apply for the whole army? I assume I have to take an
HQ choice besides the formation?
Anyhow: 5 dreads, 4 speeders, 4librarians, 6 troops with objective secured (I hope?). Very fragile, I assume, but only my favourite models and quite versatile. What do you think?
+++ New Roster (1745pts) +++
+
HQ (390pts) +
Librarian (70pts) [Mastery Level 1]
····Power Armour [Auspex, Bolt Pistol]
++++++++++++++++++++++++++++++++++++++++++++++++++++++++
++ FORMATION: Librarian conclave++
Tigurius (165pts) //warlord, reserve reroll for all??
Librarian (90pts) [Mastery Level 1]
····Power Armour [Auspex, Bolt Pistol, Force Axe, Jump Pack, Melta Bombs] //with assault marines
Librarian (65pts) [Mastery Level 1]
····Power Armour [Bolt Pistol]
++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+ Elites (725pts) +
Dreadnoughts (345pts)
····Dreadnought [Twin-linked Lascannon]
········Power Fist [Storm Bolter]
····Dreadnought [Twin-linked Lascannon]
········Power Fist [Storm Bolter]
····Dreadnought [Twin-linked Lascannon]
········Power Fist [Storm Bolter]
Ironclad Dreadnoughts (190pts)
····Ironclad Dreadnought
········Drop Pod [Locator Beacon, Storm Bolter]
········Power Fist [Heavy Flamer]
········Seismic Hammer [Meltagun]
Ironclad Dreadnoughts (190pts)
····Ironclad Dreadnought
········Drop Pod [Locator Beacon, Storm Bolter]
········Power Fist [Heavy Flamer]
········Seismic Hammer [Meltagun]
+ Troops (415pts) +
Scout Squad (100pts) [4x Scouts, 4x Shotgun] //or bolter
····Land Speeder Storm [Heavy Flamer]
····Scout Sergeant [Bolt Pistol, Boltgun, Melta Bombs]
Scout Squad (100pts) [4x Scouts, 4x Shotgun] //or bolter
····Land Speeder Storm [Heavy Bolter]
····Scout Sergeant [Bolt Pistol, Boltgun, Melta Bombs]
Tactical Squad (215pts) [Grav-gun, Missile Launcher (Frag & Krak), 9x Space Marines] //5 stay home for objective, 5 drop pod with Tigurius + 1libby of formation + libby
····Drop Pod [Storm Bolter]
····Space Marine Sergeant [Bolt Pistol, Boltgun, Combi-grav]
+ Fast Attack (215pts) +
Assault Squad (95pts) [2x Flamer, Jump Packs, 4x Space Marines]
····Space Marine Sergeant [Bolt Pistol, Chainsword]
Land Speeders (120pts)
····Land Speeder [Heavy Bolter, Multi-melta]
····Land Speeder [Heavy Bolter, Multi-melta]
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