HeroPoints (Gold) should only be spent on Roster Slots until you have all 4 stars rostered.
You should roster all the 2 stars, all the 3 stars, and all the 4 stars. It is a marathon, not a sprint.
You should not open tokens unless you have the roster space for a new character. Tokens never expire. Covers expire in 14 days.
Don't spend Command Points until you are ready to roster 5 stars. These are hard to come by and key to getting 5 stars.
Do not open Latest Legends tokens until you are ready to roster 5 stars. See #4.
If you did not heed #3 -5, do not put ISO into your 5 stars until you start champing 4 stars.
New Player Guide 2.0 / 9th Anniversary Edition
What is a 2 Star Farm, and Why You Need It
Advanced: A more reckless approach to opening tokens (compared to the New Player Guide)
Check the weekly "Team up Tuesday" post on Reddit
Check the alliance_recruiting channel on Discord