There are so many possible and viable combinations that I'm not sure there's really a shortcut to building a team. A lot of us have posted our own builds, but even with similar team compositions and identical characters I've already seen a lot of variation. The best way to proceed is to learn why these skills are desirable; that will help you figure out what heroes to put them on.
Fury is great for offensive characters and characters that you need to trigger <HP effects like Desperation or Vantage. It also carries the added bonus of adding 9 stat points to your permanent total, matching you with more powerful opponents in Arena and enabling a higher score.
Vantage is awesome, but not always the best option for every character. Takumi is generally hard to one shot (if anyone mentions Robin again I'm going to flip a table) and can counter at both range and melee, making Vantage particularly potent on him.
If you want, you can post your 5* lineup and tell us which heroes you're particularly keen on using. Then we can make some suggestions about which skills you might want to target.
Triangle Adept on MRobin
Vantage on Takumi
Brave Lance on Effie
Vantage/Brash Assault + Fury on Lyn
Very basic suggestions off the top of my head.
If you have Linde at 5* already she is a significantly better option than MRobin.
I'm mostly not concerned about the most optimal skill combinations, but more about which 4* character should I focus on feeding. I have so many that I'm searching to clean up my character box a bit rather than going after feathers.
5* Characters with their levels:
40 Nowi (already learned Renewal 3 for her B)
40 Hector (already have Vantage for his B)
Other 40's: Klein, MRobin, Marth, Seliph, Lyn, Eirika, Sanaki, Camilla, Julia
38 Peri
35 Effie (working on her right now)
33 Jaffar (working on him)
30 Lucius
1 Seliph
4* I am working on or have that have been valuable
40 Corrin
35 Tharja
34 Roy
30 Olivia
12 Cordelia (lack of lances on my team, so started moving towards building them up)
others: Catria, Abel, Camilla, Caeda, Ursula, Merric, Nino, Adult Tiki, Seliph, MRobin and way too many other 4*. I think I have 65 4* right now
My Defense Team: MRobin (40), Hector (40), Julia (40), Olivia (30). They typically win 10-15 battles per season with a score of 259. Offense team is usually built around the characters that are needed for bonuses, but typically have Hector and MRobin included in most compositions. Usually in the top 50K on offense, but haven't really chased the top tier brackets.