You indeed need to make your own plan. I always use
this online flight planner. Their routes are usually correct. Note that if you insert a flight plan, DON'T do so on the LEGS page, go to RTE and then to the next pages. Then enter the airways on the left, and after that the last waypoint of the airway on the right. So it looks like this:
KJFK DCT NEWES J225 RAALF STAR KBOSDCT NEWES
J225 RAALF
STAR KBOS
Usually, with this flight planner the first waypoint is the last one of the SID you should use.
Hope I helped u, don't hestitate to ask.
Mees