Fox Farms Ocean Forest has a lot of nutrients in it. I also use this soil. For me, I find that I don't need to feed at all in the veg cycle. Just transplant on time. For flowering, many people will tell you many different things. Since it's your first time I would try something easy like fox farms, botanicare, General Hydroponics/Organics, the list goes on. My first time I used House & Garden, no complaints. Remember when feeding your plants, less can be more. Remember the instructions on the bottle are written by a sales team who want you to use the MOST you possibly can without killing your plants.
Good luck =)