English

Not possible.
There is a button on you map that works now that you are on the mainland that did not on Silan. The left pointing arrow will take you from continent view to world view and show you all the connections between the different lands.

You can use that map to plot a route from where you are to where you want to be. Know that most routes are dangerous and the Roots are very dangerous and that goes double for a refugee from just from Silan. Having said that, it is possible to sneak from the Witherings (Jungle/Zoraï) to the Burning Desert (Desert/Fyros) to the Verdant Heights (Forest/Matis) with a little patience and luck. Getting into Aeden Aqueous (Lakes/Tryker) via sneaking is much like traveling the Roots.

Another option is to get help trekking from place to place. Remember that this takes time and listen to whomever is leading the trek. A homin that does not follow directions when trekking can cause the whole group to die.
In simple terms, as to join one. :) Read about the various guilds in the Guild Registry and pick one that suits you. Example: Guardians of Zora is a Kami and Zoraï aligned RP, PvP, PvE guild. Neutral characters can join any guild but aligned characters can only join guilds that match their alignment. In the Guardians case, that means that a Matis Citizen (don't remember the title for that) could not join the guild unless they renounced their Matis citizenship because it is a Zoraï aligned guild but a neutral Matis could join with no problem. The same is true of the Kami/Karavan alignments. Kami Disciples can join Kami or Neutral guilds (anyone can join Neutral guilds if I remember correctly) but not Karavan guilds. I did not remember correctly. Neutrals may join any guild but if you are aligned, you may only join a guild that matches your alignment.

In summary, things to consider when choosing a guild:
Does the guild do the kind of things you want to do?
Do you like the homins in the guild?
Does the guild's alignments meet with the alignments you want?

Do a little research before asking to join a guild and you'll have a much better experience than if you just ask the first homin with a guild badge to give you an invite.
Good questions and really best asked here. :)