I wonder if I should sell my top players (the 3 I got with the completion of the tutorial)
You can't sell the "star" players you get at the start, only fire. I can't remember how long you have to wait before you can sell, maybe the same amount of time the salary cap doesn't apply. Depending on their skills I'd likely keep them, it costs some salary but they can help you win games to make up for it.
and recruit 3 other trainees to train 6 of them (in 2 position training such as Rebound or 1v1)
It's better to decide what training suits your trainees, rather than choosing a training specifically because it trains six players. I'm not familiar with big man training but I don't think people normally start with RB, usually ID or IS. 1v1F can also make sense depending on the final build you are aiming for.
while minimizing my salary (as I don't have the minimum salary for at least 20weeks) and "tank" for the draft
You need about 50-70 scouting points to give yourself a decent chance in the draft, so I'd only tank if I was sure I'd have enough points and that homegrown players were what I needed.
Keeping salary very low at the start to maximise profit is a strategy that can work, I used it for two seasons in Utopia. However winning games leads to better fan survey, better attendances etc. which leads to more money. Even if you can't promote this season, winning a lot of games can still be the right path, as well as being more interesting than losing every game.
I also recruited a level 5 doctor that I pay more than 14K a week, should I fire him to recruit a level 3 to pay less salary?
Yes, I would wait until the day before the next economic update then fire him. I don't think any doctor is necessary for a new team, it's fine to save the money and go with the $2k salary one you get after firing.
What do you think would be strategy for my team?
If it was me, I would keep salaries low - keep your star players, have enough trainees, but avoid buying veteran players with high salary. I would try to win as many games as possible and try to get a better understanding of tactics while doing so. And put most of my savings into building a bigger arena, while spending $10k/week to collect 2pts/week for scouting a draft a few seasons down the line (you can save your points).
Given you've played before and already have some trainees, you are probably on the right path
