Buying 2 plan in the same time ?

Yes, you can buy multiple different plans under the same Adobe ID account anywhere in the world, so long as the desktop apps included in those plans don't overlap.

So you can buy Photography (PS+LR) and Premiere

...or Premiere Pro and After Effects

...or Acrobat DC and Illustrator

...or Photoshop and Acrobat

...etc.

The pricing on combinations of any two CC plans will always work out to less than a single "All Apps" plan, although not as good a value.

Photoshop or Premier Elements 2021 (approx $100, no subscription needed).  Elements are light weight versions with fewer options and less learning curve.  If you're just starting out, this might be all you need for now.
https://www.adobe.com/products/photoshop-elements.html

See Elements System Requirements:

• https://helpx.adobe.com/photoshop-elements/system-requirements.html
• https://helpx.adobe.com/premiere-elements/system-requirements.html

==============

Creative Cloud Photography Plan -- approx $10/month for 12 months includes these products & services:
-- Photoshop CC and Photoshop on iPad
-- Lightroom on desktop, mobile and the web
-- Lightroom Classic
-- Adobe Portfolio website + hosting
-- Adobe Spark with premium features
-- Bridge
-- 20 GB cloud storage (upgradable to 1 TB).
https://www.adobe.com/creativecloud/photography.html

Premier Pro costs approx $21/month for 12 months and includes these products and services:

-- Premier Rush

-- Adobe Portfolio website + hosting

-- Adobe Spark with premium features

-- Adobe Fonts

-- 100 GB of cloud storage.

https://www.adobe.com/creativecloud/plans.html

Please ensure your computer meets or exceeds the minimum system requirements to run Creative Cloud + OS + all other apps you use. Check each one. 

• - https://helpx.adobe.com/creative-cloud/system-requirements.html
• - https://helpx.adobe.com/sea/premiere-pro/user-guide.html/sea/premiere-pro/system-requirements.ug.html
  

Pay particular attention to Photoshop's new GPU requirements. See links below.

• https://helpx.adobe.com/photoshop/system-requirements.html
• https://helpx.adobe.com/photoshop/kb/photoshop-cc-gpu-card-faq.html
  

When you do have PPro, Some Tutorials to help you get started
https://helpx.adobe.com/premiere-pro/get-started.html
https://community.adobe.com/t5/premiere-pro/premiere-pro-tutorial/td-p/10974406?page=1
https://community.adobe.com/t5/video-lounge/tips-amp-tricks-to-become-a-premiere-pro-power-user-with-abba-shapiro/td-p/10900149?page=1
https://community.adobe.com/t5/video-lounge/video-series-real-premiere-pro-secrets-by-cut-to-the-point/td-p/10900176?page=1
https://community.adobe.com/t5/video-lounge/podcast-art-of-the-cut-coup-53-editor-walter-murch-ace/td-p/10887889?page=1
https://helpx.adobe.com/premiere-pro/how-to/premiere-pro-nesting-sequence-cc.html
Video https://helpx.adobe.com/premiere-pro/atv/cs6-tutorials/nesting-sequences.html

I live in Belgium. I guess if you can do that in US, i can buy the 2 individual plan in belgium ?