You can bring a sample of your water to your LPS/LFS, which they should test for FREE. But it is more convenient if you buy your own test kit, so you won't have to frequently go to your LFS/LPS to have it tested.
Make sure you perform a water change. Most disease outbreaks are due to stress and/or poor water conditions. When you replace the water, make sure it is very close to the same temp as the tank and that the water has been dechlorinated, using items like Stress Coat, Prime, Amquel +, etc.
The ich life cycle goes through a faster rate with higher temps. The only time the ich is vulnerable is in their free swimming stage, when they are looking for a host. This is why increasing the heat is preferred.
When increasing heat, do it gradually over a long period of time, up to maybe 82Â°F. Allot of people have increased to higher temps, but I find this safe and comfortable for fish. This is basically what all my tank temps are set to now.
You can also add aquarium salt. DO NOT add salt directly into the tank. You need to make sure the salt is dissolved in water first, then pour the solution in your tank slowly over a long period of time.
I prefer not using any medications, since some can kill the benificial bacteria in your tank and/or can stress your fish. I find raising temps and adding salt was sufficient.
BTW, keep up with the water changes during the treatment as well.