Here is my 2 cents.

1. Pick a light schedule and stick to it. Don't go pissing them about with different schedules. You'll screw them up. I suggest 18/6 for veg and 12/12 for flower.

2. If you aren't going to spring for a pH meter then skip the nutes too and invest the $$ in a bag of Foxfarm Ocean Forest potting soil. It is well buffered for pH so if your water pH is off it will make up the difference. You won't need any nutes with this soil. It takes all the guess work out of the equation. You won't screw up your plants by over feeding them, etc.

3. Start in 8 - 16 oz party cups, repot after 2 weeks to 1 gallon or equivalent pot for veg. Then repot into 3 gallons pots 1 week before you switch to flower. Also, veg for 4 - 6 weeks and then on to flower. Your lights are weak so you can't handle a huge plant. Even with this schedule you will need to LST them in a pretty significant way.

What ever you do keep it very simple. Get a grow or two under your belt and then you can start experimenting if that's your passion.