\$R_1\$ needs to be sized so that \$I_{\small{Z}}\approx \frac{V_{\small{SRC}}-V_{\small{Z}}}{R_1}\$, where that current is specified in the datasheet for the zener. The load current will be approximately \$I_{\small{LOAD}}\approx\frac{V_{\small{Z}}-700\:\text{mV}}{R_{\small{E}}}\$. You will need to accept the fact that there will only be a compliance voltage for the load of \$\le V_{\small{SRC}}-V_{\small{Z}}\$. And \$I_{\small{LOAD}} \le 10\cdot I_{\small{Z}}\$.
For example, suppose the zener diode is supposed to operate at about \$5\:\text{mA}\$. This means that your load should not require more than about \$50\:\text{mA}\$. That is, if you plan on using only one bipolar. You could use a Sziklai or Darlington arrangement for higher load currents.
You may also want to consider the idea of including a diode in series with the zener as a "hack" that helps with temperature compensation. You can refer to John Betten's "Compensating for diode drop variations" (originally from an EDN article) to gain some better understanding of why.