I'm a newb and I don't play Imperial so here's what he's got

Force awakens core

Imperial aces

Lambda

Tie punisher

I have both core sets, an extra tie/fo, and slave one he can borrow.

He also wants suggestions on what to buy next thanks for the help

Here's what I would make out of your purchases. Strong attacks, strong defense, no stress concerns.

Carnor Jax

-Push The Limit

-Royal Guard Title

-Targeting Computer

-Stealth Device

Kath Scarlett

-Push The Limit

-Fleet Officer

Epsilon Leader

-Weapons Guidance

-Twin Ion Engine

This squad is best together but don't be afraid to separate and regroup if it gets nasty. Fleet Officer could be switched out for Advanced Homing Missile but I like the long term benefits of keeping it in. Remember that Fleet Officer can also give a focus to the ship its on. Push The Limit allows for strong Target Lock/Focused attacks or keep the focus for defense. Make use of the Firespray's rear arc if necessary, it can help arc dodge while still having a shot yourself. Carnor can focus and evade to get in close and stay alive and a second focus from the fleet officer.

Here's a list that I think should work alright, assuming he has some experience flying his shuttle and interceptor:

98 points

Carnor Jax with Push the Limit and Hull Upgrade

Kath Scarlet with Veteran Instincts and Rebel Captive

Omicron Group Pilot with Vader

I prefer hull/shield on Carnor to a stealth device as he prefers to get up close, and rebel captive on Kath makes her a difficult target for enemy aces. I think that PtL on Kath without an engine nakes her too stiff and predictable.

If he doesn't fly the shuttle much then you could swap it out for Omega Leader (with juke and comm relay) or even a couple of basic TIE Fighters and the list should still be solid.