Yeah if you can get bloodwork that would be great.
cycle for 8 weeks or 10 weeks would be fine - maybe get enough product to go for 10 then you can decide during your cycle how long you want to go for.
You can use the HCG until around 3 days before starting the SERM but this isn’t really going to make any difference.
I think you will need to keep the Arimidex dosing to EOD and reduce the dose rather than frequency to achieve the taper.
Either way your plan looks good, you should make good gains and feel great.