From the looks of things, you're not going to be playing any graphically-intensive games.
I have a similar system with onboard graphics and find that to be an acceptable experience, though I don't play games nearly as much as I should.
If it was me and I was buying a system to put together, I'd wait to see if the onboard graphics met my needs before buying a dedicated graphics card. After all, it's not going to really add any labor or time to the build if you wait. Yes, you'll have to open the case a second time but you can handle that.
I have a similar system with onboard graphics and find that to be an acceptable experience, though I don't play games nearly as much as I should.
If it was me and I was buying a system to put together, I'd wait to see if the onboard graphics met my needs before buying a dedicated graphics card. After all, it's not going to really add any labor or time to the build if you wait. Yes, you'll have to open the case a second time but you can handle that.