Making a recommendation without knowing your business and needs is tough but my experience with Quickbooks inventory is not good IF you're going to process any type of volume (eg more than a few sales a week), want to integrate to your website &/or are selling in multiple channels. It's my opinion a good system will pay for itself many times over while saving you a lot of headaches on the back side IF you have a good understanding of your business and system needs.
Here are some good inventory systems which are powerful yet relatively easy to use. I'm not up to date on their pricing models or contract terms as these have been changing quickly in the industry thus I don't know which have low up front costs or are a working on month-to-month SAAS subscription model.
In alphabetical order here are some that come to mind. I have personal knowledge of the first 4 and have heard good things about the last 2. I suspect any of these will serve you well to start. There are other systems but I'm not mentioning them as they're probably to complicated or expensive for where you are.
To find other options, use the search phrase: multi channel inventory management software
Feel free to reach out if you have any other questions.