You will be commisioned as a GD RAF Officer - primary
You will then be a JEngO - secondary
Your 1st posting could be Oi/c bicycle store Little Snoring - unlikely
Your immediate objective is to graduate - priority
If you always remember the following, "Task needs, Team needs, Individual needs - vital, essential, desirable" - you should be ok for the whole of your career
Best of luck - and enjoy!
Regards B15