This is my first grow and I’ve already killed off a plant….not too happy about that but the other 2 look pretty good to me. Before I start the flowering phase this weekend does anyone got any tips or pointers for me that I wouldn’t get online? 
You always have to start off your posts with the cultivar and type.
Are these autos? Photos?
These are autos, northern lights to be exact
You do not have to do anything as it goes into flower. Autos know what to do.
Keep your light schedule as it’s been.
Your plants are looking good.
You might want to do a little LST.
Just lightly spread the stems apart and tie them down. Go easy. Just enough to pull them apart so that light penetrates the bus sites. There are a lot of you tubes showing this.
For a new grower, you look to be in track to a nice harvest.
Homegrown sells some neuts. You might look into some Flower Time neuts, to be on the safe side.
I use living soil so it is a non-issue for me. Look at MixASoil fire your next grow. Makes life simpler.
Thank you very much for your help I appreciate it