[SC] Give me tips please

Hello,
I decided to start playing this game again and so far I've been really enjoying it. The problem is I haven't played since they introduced "upgrade" system so I am getting overwhelmed by the new content they have added to this game.
So far I've bought myself goliath which is crazy cheap in auction, I'm about to get full flax and I use those lovely 300k credit lasers. I'm about to reach level 11 and I've ran out of pve quests so my plan now is to go farm kristallons until I get full lf3/b02 and 8 iris, but since each iris goes for 40-50m Its going to take a while.
Afterwards I would like to farm zeta gates but before that what should I use my uridium on? I already made a mistake by buying pet for 50k uri so I would like to avoid making similar mistakes in the future.
Currently I have 100k uridium and I will probably buy more once I see another helix sale.
So what I want to know is:
What to spend uridium on right now?
Best way to get lf4?
Which items should I try to craft first?
When and what should I upgrade?

What I would like to achieve is classcannon build, it doesn't matter how bad idea it is in current meta (so far I've seen everyone building hp and shield).

 

Hey,
I would suggest you spam zeta gates with the uri you collect. Always use the events e.g. cheap clicks for the galaxy gate and the double reward day. Then wait for the zeus day and use your keys (you can get apis/zeus parts, lf3, bo2 and with a little bit of luck lf4. If you want to spend some money on the game you can buy premium and the 25% discount package.

The prometheus laser is now the best one, so I would not focuss so much to get lf4`s. Try to get lvl 17 as fast as you can and do the Bl quests to get your free promtheus lasers.

If you use uri to upgrade I would start with drones>shields>lasers but I think you should use uri for GG.

if you want to do more dmg in the gates or on the map you should buy the moth drone formation for GG and the drill drone formation for aliens on the regular maps.