Here is my updated version then:
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0) Pull a chromium pack for 350 crystals. If you don't get a good toon, you may want to start another account until you get one.
0) Avoid to become level 8 (Arena Start) for some days and just collect energy and shipments.
see for details https://forums.galaxy-of-heroes.starwars.ea.com/discussion/86076/the-perfect-guide-for-the-perfect-start
1) Farm Lando in Cantina
2) Farm Boba Fett in Cantina store
3) Farm STH in Arena store
4) Farm Biggs in GW store
5) Farm Jedi Consular from hard nodes, other hard nodes for Biggs, Boba, Ahsoka or Chewie (max 4*).
But gear is more important than shards now.
This leads to your Arena team of Lando (Lead), Biggs, STH, Boba Fett, JC
Always keep level, abilities and most important gear to maximum!
6) Farm Dengar, Sun Fac and/or gear in Guild store (depends on how much guild tokens you get)
This gives you a Credit Heist team of Lando, STH, Boba, Dengar, Chewie which is good enough to beat it (just have Lando, Boba and STH on max).
7) Farm Ackbar in Arena store after STH is 7*
8) Farm GS in Cantina after Lando is at 5* until you can activate him, replace JC with GS for a try after GS is geared. Continue to farm Lando to 7* then
9) Farm 5-dot-health-Mods as soon as you manage the challenge. If you can't and Lando is max, farm GS.
10) Farm ship plans in GW store for Biggs', Ahsoka's, Sun Fac's, JC's and GS' ships after Biggs is at 7* and you achieve lvl 60. If Biggs is 7* before you are lvl60, safe the tokens. You can spend more a day then you will earn later. Farming ship plans until your fleet arena team is all 7* will grant you access to a lot of mats (zeta) and shards (Wedge and all the other pilots)
11) Farm Wedge, Slave I and missing ship plans in Fleet store. Level all ships (Biggs', Wedge's, Ahsoka's, Sun Fac's, Geo Soldier's, JC's) equally so you have them at 3 stars each on lvl68. You will need this for the challenge which rewards you a 2nd reinforcement place, so you have 7 ships.
12) For you last ship you might want Darth Maul (Guild Store, Fleet Store) and his Scimitar.
Others prefer TFP (for Palpatine team), or Resistance pilot (for Speed mod fights, you would also need Rey then).
13) At level 69 farm Wedge from Cantina 6-A
(very optional:)
14) Farm Leia from Arena store (after Ackbar)
15) Farm QGJ from Cantina Store (after Ahsoka)
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Enter a good guild early, as mentioned in the OP. Look at the guild activities and plan your ressource spending accordingly.
Think twice if you start with a different time zone.
Collecting/Refreshing hours are:
0 h (all activities reset, Arena and GW store refresh, shipments, new challenges)
6h (shipments, GW store refresh, Arena store refresh)
12h (free energy, free cantina energy, all shops refresh, shipments)
18h (collect arena reward, free energy, new shipments, guild + fleet + arena store refresh)
19h (collect fleet arena reward)
21h (collect free energy, guild + fleet store refresh)
Spend crystals on cantina and energy refreshes, each 2x a day is good (300 crystals needed).
For a first good rank in arena and fleet arena, use also crystals to refresh. Get a pole position.
No further chromiums needed but the first ;-)
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Have 20k ally tokens as a reserve for the next squad tournament. Get to top 500 for 1 Mio credits, MK III Ability mats and whatever more.
Aim to 5 Rebels at 7* for Palpatine Event. https://swgoh.gg/db/events/emperors-demise/
Aim to 5 Jedi for the grand master Joda Event. https://swgoh.gg/db/events/grand-masters-training/