Learning how to create professional looking logos is one thing, but marketing your work and your samples can take longer to get your head around, trust me I've been there. Whilst I don't design logos, I do try and market a specific type of illustration and this is done online and offline, it's hard, but the more you network and get yourself out there and I mean throwing yourself out there, be confident in your abilities and you'll do fine.
Running a business requires more all round effort, but if you have a plan in place, then you are much better off than those whose planning and promotional strategy is lacking.