Some questions

Just wondering if i can get the ressuscitation signet if i am in Ascalon.

Is there a big dofference between a sword of damage 14-20 and 15-22 and is a 15-22 sword a maximum damage one.

You can buy a resurection signet from ?sir bertran? the skills trainer in Ascalon post searing. This will thoguh cost you a skill point and 10 gold assuming it is your first bought skill.

I think it's Bertran too

I think that 15-22 is indeed currently the max base dmg of swords (mind that I say currently, leaving a chance to correct when future updates of new chapters increase the dmg - I don't know why they would do that but hey ... )
In my opinion there's not much difference, but 15-22 are not so hard to get, so ... it will mainly be the mods on the weapons you're comparing that make the difference (+armour or + health or increasing armour penetration and stuff alike)

To save yourself some cash, get a sword that's maybe 1 of max damage. They don't sell very well and the difference is negligible. Then you can put on the mods YOU want: pommel and grip.

you CAN get the rez signet in pre-searing ascalon. after you do the quest that gives you ur first 2 skills, go bak into ascalon city, and come out. to ur left should be the rez shrine, and lina should be there with a quest for you. you get the rez sig from doing that quest

The only qualifier here is that you HAVE to have another person with you. Luckily it is right at the exit out to the world and you can just advertise for a partner, talk to the monk, get the sig and run back inside.