Ground can either be very complicated or very simple. I have two very different sets of ground fighters; one for everyday fighting and the other for Borg missions (melee weapons). You have lots of Boffs at your disposal. Also, you want to look at your Boff's and their Traits, especially those ground traits. I'm much better with the KDF side than Feddy, but this is my normal Fed set-up:
Smaug (Tac Officer)
Ginger (Betazoid, Science, Healer duties, long-range weapon)
Thane (Jem'Hadar, Tactical, Jem'Hadar Set, mostly MK 14)
Elvis (Human, Engineer, Rep Set (various), mostly MK 14)
Edwina (Bajorian, Engineer, Rep Set (various, mostly MK 14)
Common ground will include 2 Engineers, 1 Tactical, and 1 Science.
I like using the Reputation Gear I have either bought/earned in the game for my Ground Boffs.
My Borg crew is about the same, but they use Melee weapons. Most of these weapons and gear are also MK 14. There is no real rush to update your gear if you are a average player.
Just check their traits and special characteristics (species based) of your ground crew. Also, you can adjust your ground crew to what you are. For instance, if you are an engineer, you may want to have either 2 Tactical or 2 Science Boffs with you instead of a party of 3 engineers. Depends on your fighting style.
Since I'm an old fart, I also name my Boffs by their occupation. For instance, all Engineers have names that start with the letter "E", Science with "S" names, and Tactical with "T". Ginger is the exception because I use her as my Ground Science officer for healing and normally she has red hair.
This is just the basics. Hope it helps.
Qa'pla