ernan

Something like this is probably the best sort of PC you can build for this purposes for (around) 400 USD:
PCPartPicker Part List Type Item Price CPU AMD Ryzen 3 3200G 3.6 GHz Quad-Core Processor $94.99 @ B&H Motherboard ASRock B450M-HDV R4.0 Micro ATX AM4 Motherboard $64.99 @ Newegg Memory GeIL EVO SPEAR 16 GB (2 x 8 GB) DDR4-3000 Memory $63.99 @ Newegg Storage Crucial BX500 240 GB 2.5" Solid State Drive $39.99 @ Adorama Storage Seagate Barracuda Compute 2 TB 3.5" 7200RPM Internal Hard Drive $54.98 @ Newegg Case Cougar MX330 ATX Mid Tower Case $45.99 @ B&H Power Supply EVGA BR 450 W 80+ Bronze Certified ATX Power Supply $49.99 @ ModMyMods   Prices include shipping, taxes, rebates, and discounts     Total $414.92   Generated by PCPartPicker 2020-03-29 12:01 EDT-0400   In my opinion, an SSD, but also HDD is a must to have (unless you have a NAS at your disposal). As you will want the speed, but also space to save your files.
16GB is also a must, as digital art files - especially the larger one - will need such room.
 
If it is at all possible though, I would suggest saving up just a bit more. While the build mentioned above is alright, it does lack proper room to expand and especially the CPU is a part which could be much better, if you just have like 50 USD to spend more.
 
So perhaps a second hand computer might be a better deal. Not sure what the market in the Philippines is like, but perhaps you could look into purchasing a second-hand computer from someone and maybe upgrading the RAM or something?
Where I live, I see Ryzen 5 1600 + GTX 1060 builds for 500 euros. Just add some more RAM (for about 40 euros) and you have a competent build.
Corel Draw is mentioned in the original post, which is a digital drawing program.
But it would be helpful to know OP's scope of these project (e.g. resolution).