1. when will u know ur natural test is baseline?... from what i can see..and my exp. your on deca test to 30th of march.. u will start your post cycle middle of april, run it for 4-5 weeks will be the middle to end of may, then u will need 6ish weeks off. so it would be july before you would be taking anavar.
2. 6-8 weeks i run it 50-100mg, clenbuterol is very good and it keeps the body anabolic so maintaining muscle. then eating right and training right
3. everyone differs, when am in prep, am on a prep cycle, my workouts are high rep and my diet is at most 40-50g carbs a day, but to you... do bodybuilding reps 8-12 for your exercises, 4 sets, do a bit of cardio to speed up the process, although i dont use cardio. keep sessions hard and fast, inbetween sets i take 2mins rest, but in them 2mins, i do an abs exercise (30 crunches, 30 side crunches etc). diet is the most important thing and discipline to stick to it, cut out the junk, cut down the carbs, up the protein to keep it basic.
4. dont know your experience, so not sure what to suggest, if u wanted to stay ON...in your downtime (after your last pin) switch to test prop 300mg/week..and keep it going to the summer, around the start of may add in masteron, winny/tren, anavar. the month of april you could add in IGF1 LR3..brilliant for utilizing fat tissue..and hyerplasia, muscles will continue to stay big and grow whilst fat is being lost.
other than that...ths 90% diet