Beginner investor interested in apartment investing

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Hi all! I'm interested in investing in apartments. I currently have a single family townhouse as rental property in Colorado. I currently live in Houston, TX. Is it better to invest in apartment complexes or anything more than 6 units with another investor or is it more than possible to do it solo?  I don't have much money saved for investing, but I've been reading/hearing about investors not having any money and doing this.  Just wanting some advise from other seasoned investors. Thanks!

Also, I don't mind buying in Colorado even though I live in Texas. I find that everything is expensive in Houston!