Hey sounds great Titan, can't wait! I guess I underestimated the size of the pots I would end up needing. Not sure if you read through the thread, by it's my first year gardening and a whole lot of trial and error. Will look forward to your more lengthy reply!
Sorry late getting back with you, had to swing past the farm after work.
A lot of people underestimate the size of containers you need, you could get buy with smaller size containers but 1 you will be watering a lot and 2 your plants just wont do as well.
For container I highly recommend fabric containers, plants stay cooler, you water less, have excellent drainage, plants wont get root bound and you do have some fudge room with size of the container since with fabric container the plants will air prune there roots as the roots grow out of the fabric. Fabric containers will range from a gallon size all the way up to a 1000+ gallons and you can also get fabric raised beds that range from 4 foot x 4 foot to 4 foot x 16 foot. The options are endless.
For soils I will let you know everyone has there own idea on what is a good soil for containers, some are really good others are just a mix of dirt.
If you want to mix your own I would say do a you-tube search Super Soil mixes. A good super soil mix should have all the amendment in it to get you through a season with out adding any other nutrition to it or at least very little extra nutrients. Another option you have is to use a good pre bagged mix. The soils you see at the big box store are not what you want, in plain words there junk and you will have nothing but trouble with them.
Look for a good garden center of better yet a hydroponic store and look for Fox Farms Ocean Forest its a very good soil and most hydroponic store carry it. If your lucky and can get your hands on Big Roots that is another good soil. Both soils tend to run a little hot and could burn young plant so I would cut the soil with some Promix BX.
In my containers I used basically equal parts Fox Farms Ocean Forest, Big Roots and Promix BX and my plants love it and are growing great.
Two tips for you, 1 once you plant your tomatoes, peppers ect. add some red wigglers to your containers and 2 plant a low growing cover crop.
The cover crop will help keep the soil cool and if it starts to get a bit high just trim it down a bit. If you trim the cover crop just add it to the top of the soil the worms that you add will get to it and "compost'' it right in the container for you.