Hi, and welcome to the forums!
You’re right, this kind of question is asked a lot, but because everyone has different heroes to work with, every answer is different.
Preliminaries:
- Unleveled heroes aren’t very effective. Keep your Training Camps working 24/7 to churn out 1* and 2* “feeders” that you’ll use to level your core heroes. Use TC2 as much as you can; have TC11 (or TC4) running when you’re out of backpacks. TC1 is okay as a faster option to TC11/4.
- Work on leveling 5 heroes at a time, one of each color. Give blue feeders to the blue hero-in-training, yellow to yellow, etc. Doing so gives a 20% bonus on the experience and 100% bonus on odds of increasing the special skill level.
- Work to get Training Camp 20 built and running. This is the most reliable (and only free) source of 4* and 5* heroes to build your bench.
- Build a core of 3* heroes first, then work on 4*. 4* heroes will be the backbone of your team for a year or more. Building up from 3*s will give you enough firepower to get reasonably far through all the rare quests, class trials, raid tournaments, and challenge events, and to do well on titans. Accomplishing these goals well is how you get the rare ascension materials you’ll need to ascend your 4* and 5* heroes to the top tiers.
- Any 5* heroes you get should be treasured but left to one side until later–they are tremendously costly to level up, in terms of food, feeders, and rare ascension mats.
- Level a hero up to at least the top of the 3rd ascension before shifting focus. Heroes below that mark aren’t very effective.
<breathes>
OK, that’s the generic advise. Let’s look at your roster:
3* teams
- Red: Nashgar (Jahangir for tournaments)
- Blue: Gato (Gunnar for tournaments)
- Green: Hissan (look for Belith)
- Yellow: [complete with Atman and Bane]
- Purple: Balthazar
4* teams:
- Red: Boldtusk (to add to Gormek)
- Blue: Grimm, then Sonya
- Green: Gadeirus then Melendor then Caedmon
- Yellow: Wu Kong then finish Hu, then Li Xiu
- Purple: Seshat to 3/70, then Tibertus to 3/60, then Rigard to 4/70
Overall, you should be looking to have 30 “war ready” heroes–heroes in 3rd ascension, ideally–for Alliance Wars. (If you’re not in an alliance, find one fast! Titans are the best source of rare ascension materials.) With six attacks, you’ll want six healers. Boldtusk is among the best 4* heroes, and Rigard is the best 4* healer. Melendor and Sabina will add two more. Keep an eye out for 3* Belith and 3* Hawkmoon, who are relatively quick to build, or a 4* Kiril.
Optimizing your team for titan attacks should be a priority, because good performances on bigger titans gives more rare ascension materials (on average, over time). Wu Kong (once he’s leveled up) should be on every titan attack–at least until/unless you get 5* Miki, Tarlak or Ranvir (again, leveled). You also want to bring one of the Ramming Pulverizer Trio (Gormek, Grimm, Tibertus) on every attack–choose among them based on color–so you’ll want all three leveled. Gadeirus is on the list to serve as your defensive tank until you get someone better (probably a 5*).
That should keep you going for a while! Ask questions often. We’re friendly and don’t bite–usually.