First up, welcome to the circle. Don't forget your complimentary goggles, and warpwolf plushie
Regarding what you have: pmorvahna is a good caster, but has serious natch up issues - she is extremely dependent on a handful if upkeep spells, so anyone with upkeep removal utterly ruins her day. Regarding using her as a proxy, bear in mind base size. Kromac is a medium base and epic goat lady is a large base model. You kent be able to pull it off with every warlock.
Druids, wold warden and warpwolves. Well, you can't go wrong with the warpwolf. All breeds are top class in my opinion. Druids are a utility unit however, and not a frontline unit. They're great for second line buffing and push/pull shenanigans but they will never make it as an offensive unit on their eon merits - it's simply not what they're about. Wolds are fine, but slow, and aside from the baldurs, you can't heal them, aside from the use of shifting stones. They're situational as well, in a lot of ways. They're great for geomancy, and Cassius, baldurs, and Krueger like them, but they won't find a use in every list.
Regarding where to go, as a hordes player you are kind of limited at 25pts as your need of beasts will hurt your ability to field lots of infantry. Morvahna likes infantry. A lot. Personally, at 25, I'd go with a gorax, two warpwolves, min blood trackers and kromac. Or
ekaya. Depending on warcaster what you'll take will vary. What works for kromac won't be the same as what works for baldur. You'll have to be more specific in terms of what you're looking for if you want more detailed answers.
Regarding tricks and cheese, it depends on your warlocks. Kromac and Kaya are the alpha strikers from hell, and kromac does great non linear movement shenanigans with warpath. Moravian can keep regenerating dead grunts. Baldur teleports through forests. Stones help you teleport your beasts for more non linear threats. And that's just a start.