what is your budget?

IF you want your custom pc to run games consistently, I would suggest you consider a 2nd hand gpu into your budget, example a Sapphire RX580 8gb is running around MYR500 for 2nd hand if you are able to find one, 2nd regarding about motherboard, I personally dont care about what model is my motherboard as long as it comes from a reputable company and the motherboard is the size to your liking then it should be no problem, unless you want to overclock then a higer tier motherboard is recommended, NEVER EVER BUY A PSU THAT COMES WITH A CASE ! PSU is the most essential 1st stage for saving all your other custom pc compenent when there is unexpected power surge occur, we do not live in an ideal world where the power output is consistent and predictable, so NO never go cheap on your PSU, nowadays 550-650watt should be suffice to even play a AAA title games with no problem.

Yet still recommending crap. I don't even want DRAMless SSD garbage for free.

AMD Renoir APU is coming. I would not advise getting 3200G or 3400G now if thats the path he is going to take.
https://www.tomshardware.com/news/amd-ryzen...sktop-apu-specs

https://www.notebookcheck.net/AMD-Ryzen-400...s.466311.0.html

Destiny 2 Performance:
https://static.techspot.com/articles-info/1...bench/1080p.png 
https://www.techspot.com/review/1478-destin...-pc-benchmarks/

3400G built-in GPU has around the performance of GT 1030.

I have another suggestion.. go buy 2nd hand dell/HP pc from 2nd hand pc shop...  Rm1k for the higher end pc, then u add ram and add graphic card...
hope should be within 2k budget.

What AAA you want to play? How many FPS and resolution is your target?

LOL. I got a lot of SSDs. Money already out.

Yes, the cons of DRAMless and user experience already pointed out. Its up to him.

Can't answer all of the questions; but I'll try:

1. Look for online sellers like Dotatech on Lazada:
https://www.lazada.com.my/products/amd-ryze...554bZcw3PH&mp=1

2. Most refurbished AMD GPUs (like those RX570/580) are likely to be ex-mining (for cryptocurrencies) cards, and they can be a gamble to buy them.  Either those cards can last for a long time, or may not.  You can't really tell how the cards are being treated during mining, as a lot of them tend to be used/abused depending on how experienced the user is during mining.  Usually the experienced will use things like custom BIOS that effectively reduces the voltage and fan speed of the GPU, along with temperature/humidity controlled rooms and a high quality power supply that ensures the longevity of those cards. 

3. Yes, most cheap ones tend to be DRAMless, and thus I always recommend referring to this guide:
https://docs.google.com/spreadsheets/d/1B27...2gT4/edit#gid=0

Look under the column DRAM, and if the model says 'no' then avoid them at all costs

4. No problem, and in fact if you need more CPU power, you can always upgrade to a newer CPU, provided that you have the correct BIOS for that
Tip: Get a decent B450, rather than a B350/A320, as a B450 is the cheapest ticket for you to upgrade to Zen 3 CPUs in the near future

5. Without a budget it's hard to recommend, however don't expect to get anything much for RM2K

1. C-Zone still selling it.
2. Many mining cards on sale. Its risky.
3. Kingston UV500 120GB. Yes, avoid DRAMless at all cost. chocobo already showed you the list.
4. Yes, 6 core 12 threads. Lower clock speed. Its up to you.
5. Super budget laptop not built for games. Especially when you have Destiny 2 and CoD in mind.

And the wait may give you different spec.