Since you are n TX, a north facing porch might be perfect since it will always be shaded. Our front porch faces east, so in the morning it gets lots of sun, but by early morning, the porch is shaded. If we had a west facing porch we would get the afternoon/evening HOT sun even with though trees would block some of the sun. A porch open to the south would be OK in the summer but one would have to pay attention to the roof line and porch depth to keep the sun glare out of the porch during the winter.
I think the minimum depth for a porch should be eight feet. Many porches are six feet wide which is not enough room for a chair, bench or swing and have enough room to walk around. We put in eight foot deep porches which is a good balance between space and cost. One part of the front porch is 12 feet deep to allow a table. As is true for other parts of the house design, the porch size has to be balanced with size and cost unless you have Bill Gate amounts of money.
Another point to ponder is the porch height about grade. Our local code says that a porch has to have railings if the porch is a given distance above grade. I think the distance was 28 inches. Stairs of a certainly height would also need railings. Our house is on a slope but I was able to design the porch so that it and the steps did not require railings. I had to do a bit of grading to meet code but it worked out. I did not want railings, nothing wrong with railings, but they require extra work and cost and I like the looks of the porch without railings.
I do not know if it is true or works, but light blue porch ceilings are supposed to keep birds and bugs from nesting on the porch because they think the sky colored ceiling is the sky. I wanted to put in a blue ceiling on our porches but the wifey wanted a gray colored porch ceiling and she won. We have bugs and birds nesting on the porch which I point out to her from time to time. :shocked::laughing::laughing::laughing:
Later,
Dan