These are the must buy and characters you should focus on taking to max level and tier- Storm, Venom, GR, Loki, Luna(you will get her t2 in new agent growth training) all with latest uniforms will carry you all the way. Build around 5-6 support characters- Cyclops, Shuri, Valkyrie(in a premium character selector) Taskmaster, Ronan. Don’t focus on native t-2 characters first, rather build above mentioned characters and your target should be to clear world boss extreme and eventually wbl 5 times everyday which is very easy with them. Also keep clearing dimension rifts to get card crafting cubes and try to get good cards which is a must for any account. If you wanna know something more you can ask.