SEO basics, optimize your hubs with certain keywords repeating a few times throughout your hub, but focus on making it a quality hub, rather than just stuffing keywords. A good read beats SEO any time of the day.
promote your hubs using social media sites like Facebook, twitter, mixx, digg, stumble etc... Also a few backlinks here and there won't hurt you. Link your hubs together, make a group and point to your hubs from there.
Find similar topics and post comments, put a link here and there, but don't spam. Get involved and people will respond positivity! Answer questions on the similar topics you are into, if people see you know your stuff they will gladly link to your hub.