1) What tradeskills are in place? What tradeskills are the most used by players currently on the servers of Avlis? What cities are the best for players that want to do tradeskills? Is fletching (arrow making) easy available?
Fletching is quite easily available - as for cities to craft in... your mileage will vary. Obviously, Deglos is probabably the best for mining, but most servers generally have a decent spread of craftability.
Most used tradeskills is a bit... iffy. Generally though the most successful crafters tend to be alchemy and healing item centered, as there is always a demand for potions and healing kits.
Other very high profile jobs - mainly because they're rare and completely depend on the playerbase's purchasing - tend to be liquor brewing and tailoring.
Smiths tend to be more difficult to find, at least for me, because smithing involves a lot of materials gathering, etc, and a lot of raw strength. Most of the times those with said strength are killing monsters.
2) How many players does the server allow on at any one time (general estimation is fine because of the different servers)? How many players are usually on a server at any given time?
Generally, the two most popular servers - M'chek and Elysia, usually have at least 20 people - this has been climbing to around 40 on each during peak periods.
The other servers tend to have anywhere from 10 - 20 on peak periods.
3) Which city is better/more fun to start in; Elysia or Le'Or'T'Nashi?
and why?
Ferrell and Mikona are also alternates to this; both are still quite decent for new characters. Ferrell is also rather close to the popular Elysia server, and tends to experience less lag - except on trade fair days.
As for those two choices... it depends on how you see your character. Le'Or has an abundance of high quality exotic goods, and tends to be more conservative and pro-nature.
Elysia tends to be somewhat more cosmopolitan and multicultural - or "carebear land", as Keflex puts it. Either is a good choice, but I got my start in Elysia.
Both Elysia and Mikona do suffer from lag spikes during peak hours - this is being worked on by the Team.
4) Please put these in order of what players on the Avlis Servers usually do.
Again, totally contextual, but my character tends to:
- Sit and Roleplay (ie - in a tavern)
Then I'll suggest something to a group of people and:
- Hunt (for character development/adventure)
Also, remember that Avlis is dynamic - that means the actions you take can affect the whole world. So I encourage you, go out, seize the initiative. If nothing interesting is happening, make something interesting happen. You'd be surprised, sometimes.
Oh, and as a final note:
Welcome to Avlis.

"I often quote myself. It adds spice to my conversation."
-George Bernard Shaw