If you have never trained for anything in your life, then consider the race a learning experience and a gauge to see where you need to be.
Just stick to the following rules of thumbs for road racing:
1. Try to stay up front, but not the very front.
2. Getting a little wind in your face is better than getting “yo-yoed” in the back. It also shows your competitors that you are willing to work and are more likely to let you back into the first 10-15 guys after you rotate off (which helps with #1 above).
3. Don’t pull longer than anyone else.
4. Hold your line in the corners: If there is guy on the inside of you, don’t force him into the gutter. If there’s a guy on the outside of you, don’t force him into the opposite traffic. This is one of the tougher skills to learn.
5. Be ready to freak out in pack riding. Pack riding with people completely surrounding you takes time to get used to. I’ve been in packs of 100 riders and it’s pretty scary. Like Lowcel said, try to do road group rides, it will help some.
6. No sudden moves when in the pack and avoid overlapping wheels with riders in front of you. Protect your front wheel.
7. Try to stay up front on the hills. If the pace is too high to handle and you start falling back, then hopefully some of the peloton will be there to link with. Also, careful with the rider in front of you if he stand climbs; he will float back a bit and might hit your front wheel.
8. If feeling good on the climb, save your energy for the crest. That is where the group usually hammers and where gaps are made.
9. This being your first RR, be conservative with your efforts. Some races start out at talking pace and you wonder, “what’s going on here?” Don’t attack, just sit in. An attack or surge will come and you will be holding on for your dear life, so save your energy.
10. If you get dropped, don’t feel bad. We’ve all been there.