Reasonable dosages to start (for a refreshing change!). Sust is a mixed ester concoction, so be aware that yuo have more than one half-life to consider.
I'd do 10 mg of Nolvadex every day rather than 20 EOD. Stay on the Nolvadex for a good 4-6 (preferably 6) weeks after yuor last shot to allow the body to normalize without excess estrogen build-up.
Since this is yuor first cycle, try six weeks at 250 per week, with the Nolvadex to start - NOT 8, 10, 12, or more (like that idiotic 22 week thread). Write down what yuo eat, yuor training, and any observations yuo have about how yuo feel, how yuo look, etc. This will be valuable info if yuo decide to do another cycle.