How to feed a red ear slider with pyramiding & choose a heat lamp?

A proper diet for red-eared sliders includes a complete pellet, such as those made by ReptoMin, and dark leafy green vegetables. This can be fed once per day, and the amount should be based on how many pellets Cooper can eat in 5-7 minutes. This is just a guideline, and your veterinarian can help you to determine if this is appropriate based on Cooper's body condition score (i.e. whether she is overweight or not).
For a heat lamp - photo 1 just looks like the dome, and there doesn't appear to be a bulb in it. The second lamp looks like it is a daytime only heat lamp - it is often beneficial to have a heat source that can be used during the day or at night, and if that is what you are looking for, I would recommend a ceramic heat bulb. If you are looking for only a daytime basking bulb, there are many brands that would be appropriate. The key words that you should look for are "daytime basking bulb." For watts - it depends on how far the bulb is away from your turtle - there are some brands that have a chart on the side of the box that will give you distances and temperatures that correlate with the distance. This information, combined with your desired temperature for the basking area will help you to decide on what wattage to get.
I hope that gives you more information!