I am using Happy Frog soil and Fox Farms nutrient pack. I just put the seeds in today and added “some” water but wasn’t sure if I should saturate the bags at the start?
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Not a good idea. Seedlings only need a couple of ml of water per day. The leading cause of seedling loss is overwatering. Roots need oxygen and all a seedling has is a single tap root. Roots cannot extract oxygen from the soil if it is wet all the time.
The best method for seeing that a seedling has what it needs without risking root rot is to instead use a dome and to not water the soil at all. Use a clear Solo cup or a cut pop bottle and spray inside of the dome a couple of times each day. The plant can get all of the water it needs via the leaves from the humidity in the dome. Start watering a few ml a day when the plant outgrows the dome.
Once the plant is mature you can water to runoff and then let the soil dry out before watering again. These wet/dry cycles are necessary for good root health.
You won’t need to feed for the first 4 weeks if using FF soils. Get a PPM meter, monitor runoff PPM, and then begin feeding when PPM dips below 1,000. You should also be managing runoff pH, which should be between 6.3 and 6.8.
Welcome to the forum.
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Welcome to the forum! Midwestguy has got you covered for sure. Happy growin 
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I pre-moisten soil before planting seeds then water only occasionally when bag is light… but water heavily when you do so