There are many blogs out there on tau and tau tactics, I would suggest searching for a few of them.
I like tau of war, and 3++ personally, but I am sure others may have additional suggestions.
Tau have common tactics as just about every other army; target priority, leveraging your strengths, know the rules well, know the enemy army, etc.
However, as a specialized force they are much less forgiving than others.
Here are a few basics;
Tau are terrible at close combat - avoid it unless you are doing so to protect more critical units. Many tau tactics are centered around the concept of sacrificing specific units (firewarriors, kroot, piranhas ) to keep the enemy at bay long enough for your crisis suits and railguns to do their job.
Crisis Suits - these are the backbone of a tau army; lose these, and the rest will fall soon. Use their weapons to fill any gaps or take on specific roles in an army.
* missile pods - for monsterous creatures, knocking out transports and suppression fire on other light armor.
* plasma riles - for negating marines,
FNP and against
MC
* flamers - yes, flamers. I have roasted many a ork and
IG troops with them...never underestimate what a flamer can do on a crisis suit.
* Fusion blasters - very situational, some players recommend them, I cannot. If you find blocking (keeping the enemy at bay) hard, this may be a suit system for you.
* BUrst cannons - forget it, we have plenty of other S5AP5 guns...until we can put missile pods on firewarriors, this is a waste.
Railguns - yes please. Take them, as many as you can. Hammerheads are great, as they also offer the template (for killing troops). Unlike other armies which can get reliable anti-tank in almost every slot, we can only get it in heavy - tragically that means every skyray or ionhead or sniper team is one less raiilgun.
Regarding your specific list;
You are going to want more crisis suits. These are our best weapons, and then learn how to utilize their jump shoot jump (
JSJ) capability.
Broadsides - three railguns in one slot, plus shield drones - you will want some of them.
Pathfinders - you are going to need more markerlights, or maybe put a few in your friewarriors or stealth teams.
Sky ray - I LOVE skyrays...never run them. WHy? One less railgun. Markerlights are for removing cover saves. Again, we dont have 18 las cannons, so each railgun shot HAS to pen - thus, we HAVE to remove cover saves.
Devilfish - you are going to need a fish. Mag the turret on the skyray, so you can use it as fish.
If this is all you got, then its a great start;
Thats looks like only about 1000 points...see if you can get some 500 point games with your friends, and just used the units.
You can't really build a tau army with only 1 crisis suit, but until then, learn how to move the crisis suit, try differenet loadouts.
You can practice as well with the stealth guys (the tactic of jumping out of cover, shooting, then jumping back in).
Practice moving your hammerheads around, put distruption pods on them, and get used to trying to be more than 12" away.
Try out the gun drones or smart missiles, see what fits your style more on the fish (converted skyray).
Get used to moving the pirahanas, they are great (expensive) little units, get used to moving them. Just remember, in most games, there job is to die while blocking the advance of enemy transports trukks and tanks.
Here is a great intro to tau tactics;
http://tauofwar.blogspot.com/2009/10/joining-tau-empire-beginners-guide-part.html