A Couple of Problems

I've been growing marijuana for about 4 months, started my mother plant from clone and planned on producing bud by this point. The problem is that i cannot clone my mother plant, the only method ive tried is , clip it dip it in rooting horomone and then stick it in soil, water it mist it and let it grow. This method worked with my mother plant but I have not been able to grow a clone since. My question is what is the most successful cloning procedure for yourself?

My second question has to do with a seedling i have. I started this plant from seed and it immediatly had a growth spurt which forced me to prop it up with a pencil, now im left with a plant dependant on support. I was wondering if i should repot it so it can support itself, or does this cause problems with rooth growth?

My third problem is with my mother plant. It frequently get yellow leaves, the leaves are always old. Is this due to the plant not being able to support the leaves? The roots are at their limit right now so i figured that there is nothing i can do but repot it.

Thanks ahead of time for any responses.

i just solved the seedling problem, turns out it does support itself now.

there are some excellent grow faqs on cloning techniques ....if you use your search engine it should bring them up for you... you need to have a fan blowing air over your plants constantly,,that will make the steams strong ...and keep your lights close enough so the plant doesn't have to stretch itself to reach the light.....
The yellow leaves could be a sign of nitrogen diff.....but you should post some photos to be sure