New to gardening please help
 

First time poster,

I would like to introduce myself, I am Tino and I will be setting up raised
beds, or I can do deep tilling, open to suggestions.

What is best bagged topsoil or a mix of the current soil and nutrients, I
assume it depends on what fruits/veggies I will be growing

The garden will be in a suburb of Houston, TX

What would be good edibles to grow here?

I would like to grow avocados as well, even if I had to bring the plants in
several times a year due to the cold.

Please be gentle as I am a newbie, but very eager to learn

Thanks in advance
Tino