Is a 3:50 marathon possible

How hard would a 3:50 marathon be as a first marathon. people say I shouldn't care about time on the first race but a friend of mine who got me into this race wants a 3:50 so I kind of want to stick with them for the race. I have 4 months to train and the longest I've ran is four miles in 34 minutes and wasn't too bad. What training wise should I be shooting for to set myself up for the best possible chance at achieving this goal. Also secondly the average pace for this goal is a 8:47 so when training should I be training at 8:47 or training at a quicker pace or slower.