I've not played Battletech in a while (they were introducing clans when I last played to give you an idea) and while BT isn't for me, I'm interested in playing Alpha Strike.
Welcome back!

And great choice on picking Alpha Strike -- that how I get my metal mayhem fix these days also!
I'll get the Alpha Strike box when it comes out, but I was looking at a Succession Wars period list. However it's been so long since I've played I was wondering about putting together a couple of forces (Inner Sphere Succession era and then expanding the clan in the box).
How big is a standard alpha strike game?
I can't speak to a "standard" game (not even sure if such an animal exists yet for Alpha Strike), but usually I play company-on-company games that range to roughly 300-500PV to a side.
Is the starter box a good idea to get a couple of lances of 3025 mechs?
Yes, in fact it is intended to be a Succession Wars starter set, with all the cards and sheets inside giving SW variants.
Are there any particularly good boxes to get for succession war mechs?
Most of the Inner Sphere Force Packs currently in print are great sources for Succession Wars 'Mechs. The only one off the top of my head that is Clan Invasion or later is the Heavy Battle Lance (as it has the Axeman, Bushwhacker, NightStar and one other I can't remember, but all of them CI or FedCom Civil War designs). Sadly, the ones with the Unseens are temporarily out of print (we dood too good a job, fellas, and now there won't be more till after Christmas...), but other packs are still circulating.
Is there a particularly good clan box to expand the clan side in the Alpha Strike box?
The Clan Invasion starter box is a great place to go first, as it gives you over a star of the most common Clan 'mechs and two points of Elementals.
Is tech-1 ok when playing against later eras (ie is the points system robust enough to balance the differences in tech level?)?
As a SW player myself (who is going to dip my toes into the IlClan era in the near future) I can't speak as well to that, but the rules make it easier to have matches against disparate tech levels, as the rules are more compressed. However, it is still probably a tough self-inflicted challenge to take a SW-era medium lance up against an equivalent lance from a later era.
Inner Sphere:
Warhammer (repeat) Yes, this is SW-era
Phoenix Hawk (repeat)So is this
Atlas (repose)This one too
Archer (-2K or -5R)The Archer in general was around in the SW, though a -5R may not be an exact SW variant. The mini would still be valid for a SW force though.
Wraith This one came about during the last years of the Clan Invasion or the early FedCom war, so it would not be appropriate for a SW force.
Blackjack (-3) The Blackjack was around in the SW, though the BJ-3 may not have been. Like the Archer, it should be fine for building an SW force though.
Wasp (-1D) The -1D has been around since the First Succession War, so it's golden.
Locust (-3M)This particular variant may not have been around, but the Locust in general was.
Are the inner sphere mechs all good for succession wars era?
Starter box is:
Awesome
BattleMaster
Catapult
Commando
Locust
Shadow Hawk
Thunderbolt
Wolverine
Would the two boxes (with 4 lances) be enough for a decent Alpha Strike list? Is there anything people would recommend getting?
Maybe the Beginner's Box, as that'll give you a Griffin, completing the 55-ton Trinity of Shadow Hawk, Wolverine and Griffin.
Is the Succession War card pack valid for the next box and a good idea to buy?
The card pack's 100% optional. I just print the cards off the MUL and put them in sleeves.
Cheers.
I've gone with picking up the Starter and Clan Wars boxes to fill out my armies, and give me some variety. I'm also looking at some metal infantry and vehicles to fill out forces.
Now I just need to pick factions.
For the clan stuff I'm not super fussed and just want to go with a nice colour scheme.
For the inner sphere do you still have the freedom to create a minor house or mercenary company, or has the map been completely filled in during the last 25+ years?
You always have the freedom to do that -- it's your game, to do with as you like. And there's always room for other mercenary companies or troops of some obscure planetary duke or other ways to carve out space in the universe. In fact, back in 2018, House Arano and the Aurigan Coalition were ported into the canon BTU from the computer game, so there's certainly room for expansion there...
