Advice for a beginning real estate investor

I'm new to real estate investing and have a passion and interest in growing my knowledge. I currently own a single family property in Concord, NC. I'm stuck on whether I sell the property in search for a multi-family property or if I pull equity out to purchase my next property. The property is valued at $200,000 with a $130,000 mortgage. My monthly mortgage payment is $1000. My tenant is in her second lease with us, first a 12 month and once that ended signed a 18 month which ends May 2019. I'm collecting $1150/month rent. Any advice on what I should do, or where I can look for answers.