My first PCB, need your opinion to get better

hope this is the right place for getting feedback on my first desgin

I probably made design mistakes and will be glade to hear from you

first, this is small board so used

1) 8mil data track size, 10-16 mil GND and VCC track size

2) 8mil clearance

3) 8mil distance

3) 20mil drill

can really batchPcb handle it? (the site say yes)

some specific questions

up area

DRC return overlap error of some antenna parts, corner and connection

way? what to do with it?

this part probably need via under (can be found in TI usb BLE desgin http://www.ti.com/lit/ug/swru270b/swru270b.pdf) , as you can see the 20 mil via is little bit big

and over three pads all ground.

DRC return overlap and clearance errors, can I ignore it as it is overlap ground pads?

what else can I do?

center area

1) the MCU part (which I did not design)

DRC return overlap and clearance errors for all its pads, can I ignore it as this are the MCU dimensions?

2) MCU should have via under is ground plate as in the picture

DRC return overlap what should I do?

other

1) my GND and VCC route are 10-16 mil instead of 8 mil, is it better?

2) not all my route are 45deg because of space issues, is it critical?

3) I have made some route T junctions,are they ok?

thanks