when to begin and how long to use nolva and clomid

i am currently in wk 9 of an 11 wk cycle of a 650 mg/wk combo of test c & e. in each inj. i have 200 mg test c and 450 mg test e and for wk 11 will be test c and no test e. this is what i know and have questions about...

begin clomid: test C 18 days - test E 14 days
since i was using both should i start my clomid 18 days after my last inj or begin sumthin like 16 days? i was going to do 100 mg ed for 3 wks this too long or not long enough?

Nolva: did 10 mg ed on cycle...will continue for 3weeks after last inj at 20 mg ed. this ok, not long enough or too long?