The
bell at a pier in many zones all connect to each other. There are two flavors of bells, "Travel within Qeynos" or "Travel outside Qeynos".
To get to Antonica from a bell, go to the "outside" bell. You will always appear at the Antonica Pier, in the far southwest corner of the zone. There's a bunch of solo mobs around there to start you off.
North Qeynos to Antonica takes you to the NQ gate in Antonica. Pick up
this quest before heading out the NQ gate - all the mobs are right there.
South Qeynos to Antonica takes you to the SQ gate in Antonica. This one and the Antonica Pier are closer to the Griffon Tower, a handy means to quickly cross Antonica.
You didn't mention your level or class, but you're looking for
low level stuff. I recommend you run around Qeynos completing as many quests as you can before heading out to critter-hunt. You can easily reach level 12 just through questing, gain some coin, armor, equipment, and maybe some furniture for your room.
If you are ready to head out and hunt, the areas near all gates and pier are good low level areas. The further east you go, the harder they are. If you like dungeons, go to the Down Below (iron grate in many zones).
Go to the
Hunters Cabin in central Antonica (take the road east from the NQ gate). There you'll find a merchant and mender, and upstairs is a charming lady named Matsy Rollingpin. She can give you repeatable quests and gives you some good food/drink as a reward. In fact, one quest consisted of taking a mug of ale downstairs to a drunk barbarian. That's it!
You have only
2 slots in your house vault. But like klyia said, put a bag or box in it to add more space. Once you put them up for sale and log off, they will remain on the market for up to 24 hours. After that, you must log back in as they have since been removed.
City Writs can give the guild exp only if they are done by "Patrons". Check your guild window to ensure you are flagged as such. If not, a guild leader can change your status.
Writs are grouped by levels of 5, so as you gain levels, you must take on harder writs.
Here is a good link for writs and where to get them.