Feel free to ask more, when you need help, in the mean time i will just copy-paste my old post hoping it will help you out some more.
1) Read the beginners guide to SH: https://www.reddit.com/r/SoulHuntersGame/wiki/newplayer
2) check out reddit's Q&A FAQ thread: https://www.reddit.com/r/SoulHuntersGam
3) check out the Wiki for specific and mostly general info: https://www.reddit.com/r/SoulHuntersGame/wiki/index
4) Check out hero viability and tier list by ZiOiP: https://docs.google.com/spreadsheets/d/
5) A common & generally good team for Arena: Zem, Taurus, Xanos, Lumos, Firehawk
6) A common & generally good team for Campaign: Zem, Taurus, Xanos/Lumos, Jasmine, Firehawk,
7) A common & generally good team for Early HoL: Zem/Goram, Kong, Jasmine/Blood spear, Ling Ling
7) My guide still incomplete & Outdated and i don't plan to update it either (unless something changes my mind) but better than nothing and the COF section is pretty decent: viewtopic.php?f=18&t=12026
8) Heroes considered good by Most of the players and you can upgrade them without hesitation: Zem, Tashi, Taurus, Kong, Xanos, Nilya, Lumos, Serafine, Jasmine, Firehawk, Blood spear, Ling Ling, Goram, Sylphi, Ezio [7* only], Desmond. Malrath, Li twins.
9)This was a pre-generated answer if your still having problem please comment back.
10) If you received no answer or an unsatisfactory answer go ask at Sh subreddit's weakly Q&A thread as well: https://www.reddit.com/r/SoulHuntersGame/
11) As for the jades event if you can grab 600 Jades go for Sylphi then Goram if not then Go for other heroes.
12) As for Begginers Quest Hero choice Go for Wraxious though i won't recommend upgrading him either.