Reviving my old pc

[LinkZoid]

I'm planning to revive my old pc (BTW  kinda new to pc build)

I would like to osu some of the parts of the old pc like:

Case, HDD: Barracuda 7200.11 320gb, PSU: Orion ATX-600W V 1.2 (Maybe)

BTW I'm on a budget of 200$ Yah I'm poor~

And replace the others parts and change it with:

MotherBoard: MSI H81M-P33 LGA 1150 Intel H81 SATA 6Gb/s USB 3.0 Micro ATX Intel Motherboard

CPU: Intel Pentium G3258 

RAM: Crucial Ballistix Sport 8GB Single DDR3 

 

So my question is:

Is this good enough for gaming (Not that big of games)?

Is my PSU enough or does it lack of Watts?

Should I just buy a new psu and if I need to what should I buy in a budget price?

Will this work properly without GPU? If not what should I buy a budget price?

Is the parts compatible?

Should I change the parts that I've pick to buy? If yes what are the alternative parts (Almost the same price with the original parts)?

[littlelegsone]

what do you want to be able to use the pc for once its upgraded?

[LinkZoid]

I'll do some video editing and play this games: cs:go, osu, H1Z1, gmod and maybe rocket league