Any advices what better to do next and how chill my base (base game, DLCs off)

[PurinPlay]

Good time to you reader 
I need an advice what to do next, i kinda have basic needs stable for dupes, slowly reasearch thing and building around starting biom. 

Right now im preparing to build liquid door and some atmo suits in bottom part of my base. Any advice what to do next?

Also my base slowly overheating and i need advice how to chill it in early game (also i know that i can build temperature shift plate made of ice to quickly chill some space in case of emergency).

[asurendra]

Try to get some oil and start plastic production. Steam turbines are the core of cooling systems. Until that there are plenty of temporary cooling mechanics: AETN, ice maker, wheezeworts... Keeping some natural tiles also helps as their thermal mass is much higher than just air. Strip mined base heats faster

[Pproy]

So, my first impression (and please take it with a grain of salt since I could always be wron). In term of temperature, you're probably fine for a little while longuer. Yes the base is heating up, but your farm is well isolated in a cooler part of your base far away from heat producing building. So food is fine for now.

Before suits, think of building a more sustainable way of producing oxygen. I dont see electrolyser, and algae always run out faster than you can think.

Otherwhise, not a huge priority, but the natural gas geyser is well placed to build a more robust way to produce power, which will be important to produce steel and plastic, like @asurendra said. Please note that this will produce much more heat and carbon dioxide.

[Gurgel]

For better cooling, circle the water with pipes and tanks. It is free.