It all depends on the products that you are promoting or how do you planned on pursuing it. It also depends on the contents of your pocket. lol
If you already have a domain, you can use the subdomains for campaigns if it has the same niche or topic.
Why not use free sites instead if you are serious enough on that. dot com's are $9-10 nowadays while squidoo, hubpages, wordpress and blogger are free.
Long term, I believe it would be beneficial to you to learn html. It is real easy to learn and will help you in the future. You can learn it very quickly. It also helps you to edit even wordpress sites.