I don't want to be a buzz kill but you'd have to be fairly lucky to get some good kiting conditions down there at this time of year.
As you can see on the forecast you will most likely get fronts which can get pretty gnarly/dangerous for newbies.
Easterlies are the most reliable winds down there, and you will get those mostly in the summer when it gets really hot and there is no wind in Perth.
If you have winds between NE and E you can't go past the flat water spot in Albany off Frenchman bay road, super easy access and a great beginner spot.
Many other spots would be waves in this area and not so beginner friendly.
Hopefully you don't have very high expectations for winds...from experience traveling down there at this time of year you will either get weak winds or strong storm fronts...
Have a look at the weather stats for April last year.
Albany:
http://210.8.186.60/climate/dwo/201504/html/IDCJDW6002.201504.shtmlEsperance:
210.8.186.60/climate/dwo/201504/html/IDCJDW6040.201504.shtml As you can see from the stats, very little easterly winds and when the winds do get strong, you have rain which means a front...
if you wanted to do a kite dedicated road trip now, it'd be a much better idea to head to Shark Bay and Exmouth where you will enjoy some nice winds and warm temps!
Christian