Focus on running first and lifting later. Don't expect a huge performance gain by strength training. Your gain will be in strength, which will reduce injury risk and possibly increase flexibility. To reduce soreness start small, 1 day a week, one set of 12-20. then move up to 2 days a week during the off-season months, then one day a week during the in-season months. Start off with a "test day", find a weight you can lift a maximum of 4-6 times, then calculate your one rep max, from this you can then calculate your 12 rep max. Start with 1 set of 12 reps and simply increase the reps, not the weight, until you reach 20 reps or more. Test again, start at 12 again, repeat... As a distance runner your focus should be on muscular endurance, this is different than cardiovascular endurance.
Provided that you are only lifting 1 or 2 days a week and doing single sets of exercises for each muscle group there is no way you will gain unwanted mass.
Leg Press progress to Single Leg Press to Power Clean
Bench Press progress to Dumbell Press or Pushup on bench/ball
Lat Pulldown progress to Dumbell Row
Bar Shoulder Press progress to Dumbell Shoulder Press
Alan