Hi nippon,
good to see you opened the file, I was trying to see your e-mail to send it but it is not listed.
Ok, now, answering your questions:
1) I will do these exercises everyother day, that is to say 1 week 4 times (MWFS) and following week 3 times (TTS).... 6 days a week not.... by the way, have you read the theory and principles behind HST..... if not, I encourage you to go to HOME and ARTICLES and read them, otherwise, you will lack the necessary base knowledge.
2) Yes, on the same day I do squats and deadlift.... both are for me the best compound exercise and stimulates not only your legs but your whole body.... so, I tend to lean a lot on these 2 exercises... however, my deadlift is not 100% pure deadlift, within a set I do 1 rep of normal deadlift followed by 1 rep of stiffed leg dead lift, followed by 1 rep normal and so on.... in order to stress more my hamstrings.
3) As you can see I am starting mainly with 10 reps because I am doing a variation of HST, instead of increasing the weight with 15 reps I will keep the weight at 15RM and increase the reps by 1 or 2 in each workout... and when I reach 15 reps I will increase the weight.... now, for squats and deadlifts I will start with 15 reps because I love giving my body a good kick.. I really love feeling hell with these exercises.... feeling I want to finish faster than slow dancing with my mother in law, he he he... if I have learned something in weight lifting it is that the more you suffer the better for your muscles.
however, please do the traditional HST, increasing the weight with each workout... but read the theory !!
cheers