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Planet Coaster is great, I got it for full price and don't regret any single cent.

Problem is, I don't know if your GPU is enough to handle that. I'm also afraid nobody will give you answer on that, as performance is hard to measure and game X having Y FPS on GPU Z doesn't say anything about gpu ZZ or ZZZ. Personally I have steady 60 FPS ultra on GTX 970, but as I said, that tells you nothing.

Battlefield 1- I'd say no to that.
The minimum spec:

OS: 64-bit Windows 7, Windows 8.1 and Windows 10
Processor (AMD): AMD FX-6350
Processor (Intel): Core i5 6600K
Memory: 8GB RAM
Graphics card (AMD): AMD Radeon HD 7850 2GB
Graphics card (Nvidia): Nvidia GeForce GTX 660 2GB
DirectX: 11.0 Compatible video card or equivalent
Online Connection Requirements: 512 KBPS or faster Internet connection
Hard-drive space: 50GB

The recommended spec:

OS: 64-bit Windows 10 or later
Processor (AMD): AMD FX 8350 Wraith
Processor (Intel): Intel Core i7 4790 or equivalent
Memory: 16GB RAM
Graphics card (AMD): AMD Radeon RX 480 4GB
Graphics card (Nvidia): Nvidia GeForce GTX 1060 3GB
DirectX: 11.1 Compatible video card or equivalent
Online Connection Requirements: 512 KBPS or faster Internet connection
Available Disk Space: 50GB

Planet Coaster- Maybe
Minimum:

OS: Windows 7 (SP1+)/8.1/10 64bit
Processor: Intel i5-2300/AMD FX-4300
Memory: 8 GB RAM
Graphics: nVidia GTX 560 (2GB)/AMD Radeon 7850 (2GB)
DirectX: Version 11
Storage: 8 GB available space
Additional Notes: Minimum specifications may change during development.

Recommended:

OS: Windows 7 (SP1+)/8.1/10 64bit
Processor: Intel i7-4770/AMD FX-8350
Memory: 12 GB RAM
Graphics: nVidia GTX 980 (4GB)/AMD R9 380 (4GB)
DirectX: Version 11
Storage: 8 GB available space
Additional Notes: Recommended specifications may change during development.

How long can i earn like 2000$ just to all in for a monster PC, hmm

gofundme ( just kidding xD )

Battlefield 1 broke my PC like a week ago ;x I was playing beta before on almost all ultra seetings, good fps, PC wasn't ultra hot. So I bought the full version when it was cheaper played like 3 hours and my PC broke ^^ Same settings in full as in beta. Also I like how u just wrote "i5" like there's 1 version available :P

your GPU is very weak, instead of 4Gb ram you can probably buy a better GPU. If you don't mind playing at lower settings most "gaming" cards will be enough. By that i mean buy gtx X60 cards or their amd equivalents. My old AMD card (i think it was the 7560) could run most games at 30FPS at the lowest setting at 1080p.
IMO you should buy the minimum recommendation GPU for bf1 for your PC (you can probably get it very cheap if it is second hand).

I think the easiest way to know if my PC can handle those 2 games without spending money is to - torrent it. Yes you read it right, I might have to download a crack copy of "both games", and for your clarification,

I am willing to buy the game, I will not torrent it to play it and keep it longer.. because i am really planning to buy the game as i want to play it legit and legally. I will just have to torrent the game JUST to CHECK if my PC can handle the game itself, if it lags or if it's something else, Then i wouldn't buy the game yet ..

I think you will struggle with Planet Coaster. I have an 760 card with 18GB RAM and it runs fine but once i get to around 2000 guests....or less if the park is very detailed i start to see problems. Can still play it but there are limits.