You have posted several questions here on Trulia regarding purchasing, investing, etc. You also mentioned your from overseas. This is exciting that you are looking to invest in the Houston market, one of the top 10 markets in the U.S. for several years now.
It would be our recommendation to get with a Realtor here in Houston that can represent you and answer your questions one-on-one. On HAR.com, there is a feature regarding Multi-lingual Realtors. There are Realtors in Houston speaking over 93 languages! You can search for those Realtors that speak your native language!
Regarding the land, there are some rules and permits you might need to obtain if you plan to develop a raw piece of land. For agriculture on vacant land, typically no issues and possible tax breaks. Good luck with your investments!!
Bernstein Realty, Inc.
Anna Maria Durr, NMLS 266699, TREC 596662, Codemark Financial
2626 Richmond Ave., Houston,Texas 77098, 281-592-0667