Goals are obvious:
- Have fun
- Profit
So, once i bought the spell book (basically entry fee, 10$), i played for a couple of days with starting deck and decided to buy some card packs, first 10$ then another 10$ and finally 20$ for a total invested of 50$. Now, i wanted generally to invest 100$ in crypto but long KYC times made it difficult (still waiting for Gemini...) and so Splinterlands was a perfect way to do it.
Overall my deck is currently worth $40+ which considering 10$ went for the spell book is basicly 1 : 1 ratio to my investment which gives me now more cards to play with and thus chance to get more rewards from higher leagues but still, what i did was a mistake in hindsight.
You see, as it is always the case with gambling, you rarely get back more or even the same what you invested. I was really lucky to get 1 : 1 my money worth and that's all thanks to 1 card:

Otherwise my deck would be worth around 10$ which is 1/4 my investment in cards and 1/5 my total investment in Splinterlands...
We know that cards will most likely go up once they are out of print / Splinterlands gains more players, thus the safest way to make some money long term and still have fun would be:
1). buy credits worth of our intended investment
2). after playing for a weak or so, just go on the market and buy cards you want
This will leave you with far better deck and 1:1 investment that will (possibly) only go up in value.
Join a official discord and ask if you are unsure about something.
Join some guild and ask them as well.
Don't invest more than you can afford to lose.
PS: if you want to start playing Splinterlands, i provided some reflinks. Would appreciate.