I don't really have a suggestion for a squad in mind, but if you want, just check out my squads. I've got to have at least 10 Nym squads in there, mostly Imperial, so you can find something you like.
As far as play tips; I'm not a very good player, so take my suggestions with a grain of salt, but I have TONS of experience running merc teams. Here are some of the tips and tricks I have learned playing mercenaries:
-You MUST keep Nym moving. If he stands still in the open for more than one round, he is a dead man.
-A strong balance of Chiss and Gotals is necessary. The Gotals can get door control and that Intuition sets 'em up for a huge Furious Assault, but the Chiss can lay out the pain. Use Deadeye, Opportunist, and Double and make your opponent cry.
-Always keep the Chiss in the rear unless you have a great opportunity for a Furious Assault
-Accurate Shot is really not that important to have with mercenaries. Their attacks are too low to reliably hit a big target in cover anyway, and I'd rather have two extra mercenaries or a Merc Commander instead of Veers.
-Utilize Nym not as a heavy hitter, but more as an interference piece. I have tried many times to get Nym behind cover and blast away at a big ranged enemy, but his Defense is so painfully low, even with cover, that Nym comes out maybe 75% of the time on the wrong end of things. Instead, swap or tow him in and use all of his different SAs to wreak havoc in their back lines, then swap him out as soon as possible afterwards.
-With Nym's Recon, reserves may be a good idea if you can afford them.
-Remember Jabba, Crime Lord from A&E? He is a cheap and good way to upgrade your mercs' damage output.
-With Nym teams, you've always got ways to keep opponents on their heels. Use Furious Assault, Grenades, Disruptive, and the like and keep the pressure on at all times. Play defensively and you will lose almost every time.
I could go on and on and on, but I have other things to do, and I am certain that you also have better things to do than read a sprawling post about merc squads.
Anyway, hope that helps.