stem size and plant trimming

so i'm new,this is my first time growing almost anything my plants are 6 weeks old i've gotten rid of the males and now have 5 healthy plants aprox. 20 inches tall the stems are 1/4 in around they seem pretty small compared to some of the plants i've seen on line i've never trimmed them and they are in soil,now is there something i need to do to bulk them up? my soil mix was taken from a vid on google called stoned free and i've pretty much stuck to that guideline i'm only using a common 4 foot flouresent(whitch i'm upgrading as soon as i can decide what to buy) and i just got a hydro set up and can't decide if i should transplant my exsisting plants in to the hydro or start clones and put them in the hydro and finish off these in dirt this is all in a decent sized closet but i would have trouble doing both soil and hydro @the same time. hope you have some helpfull info

Welcome 64t100sc.

If you have not started flowering how do you know they are females?
Sorry having prob following the story here.

What is your light cycle?

If I had 8 females in veg I would pic the best 2 or 3 of the 8 and make them Moms for clones.

chop up the plant when it gains a little more height and throw the clones in the hydro.

so the lights are on 24/7 and the plants all have the white hairs not the pollen sacs. is that considered flowering? i guess i thought the "flowewrs" were still on the way. as soon as i reasearch how to post pics i will