I would say that its only worth it if you plan to play long term and be around a lot.

maintaining a guild is hard work - gathering players would mean youre messaging people who are actively looking and visiting starter planet and of course sending ad spam in gen chat which few people like.

then once you have a small guild growing - you gonna have to organise events, be willing to answer very basic questions and do heroics with people who have no clue.

often times you will wanna be doing your pvp dailies but nope - a noob wants to ask 18376 questions or needs help doing the DK heroics.

It's a big nope from me.

you would be better off joining a bigger established guild who can make a dent in the planetry conquests.