Question about investing under current LLC

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I am currently working as a Texas Notary Public, loan signing agent, and as such have already established an LLC for tax purposes. I am wondering if I need to set up a new LLC for Real Estate investing or can I use my current LLC. This is not a difficult thing to do here in Texas, you don't need an attorney to set it up for you, just need to fill out the appropriate paperwork, pay the fee, and file with the Secretary of State office. The current name I am using is not really appropriate for investing purposes, so thought about registering a DBA name with it as well in order to do my investing. Any advice would be appreciated.