You will hear all kinds of differing opinions on this issue. Some will say ED some once per week and some EOD etc etc etc....
If this is your first time keep it simple and do it once per week. I always have and never had a problem with growth and not being optimised as some would say and my favorite of "not taking advantage of the prop" never hampered me. It's all bullshit.
Some poeple in their infinite wisdom and their noble search for knowledge get things too complicated. All the esters in sust work as one long ester, NOT one by one. Sustanon acts more like a single ester test in the body with extremly stable blood concentration levels. This is why lower dosages give better results then a test ester like Enanthate. Many here made 20 lb bains on 250mg every week. Try to make gains like that on cyp or enethate at the same dosage and injection frequency. Good luck. I personally made decent gains with as little as 250mg every 2 weeks. Again, sust like all other test esters was designed to be used in medicine primarily as hormone replacement, hence stable blood concentrations are very desireable, Sustanon was designed to function and mimick one long acting ester with minnimal spikes and immediate action upon injecting.