Amibroker xperts pls help in coding this strategy

hello amibroker experts,

i have a simple trading strategy , which i want to convert into an afl.
This system uses the zig-zag indicator and an MA.the idea behind the system is to catch trend reversal.

Buy : when these 2 conditions are satisfied.
a) 10 EMA below 20 EMA , which indicates higher TF trend is down ( Pls allow user to change these EMA settings in the parameter window to do further research)

b) Lower TF zig zag indicator makes a HH.

Short : when these 2 conditions are satisfied.
a) 10 EMA above 20 EMA , which indicates higher TF trend is UP.
b) Lower TF zig zag indicator makes a HL.

also pls allow options to change EMA and ZIGZAG parameters thru parameter window.

I hope i will get help in craeting afl for my system .Thank you members.

Krishna Acharya.