You should read these stickies:
- advice for new guys
- protocol for injections
Yes you can use AI:Arimidex/anastrozole and SERM:Tamoxifen/nolvadex together.
Higher doses of SERM can cause a lot of T-->E2 inside the testes and anastrozole cannot stop that in the testes.
40mg E3D is OK because of the long half-life. But the peals will be high and LH spikes may lead to higher E2.
Do not stop a SERM suddenly, taper out.
You should be doing lab work instead of flying blind. 100mg T per week works very well for most. Higher doses can cause problems and difficultly getting things balanced.