How can I configure /etc/hosts file to point to apache web server?

For your hosts file:

127.1.1.1     someaddress.lan www.someaddress.lan

By the way, don't you mean 127.0.0.1? That is the loopback ip address for localhost. If so, use the following:

127.0.0.1     someaddress.lan www.someaddress.lan localhost.localdomain localhost

Then you need to edit your apache server config file. Usually /etc/httpd/conf/httpd.conf That is where you associate sub domains (Virtual Hosts) with directories containing the content the apache server serves.

Apache Name Based Virtual Hosts

NameVirtualHost *:80

<VirtualHost *:80>
ServerName www.someaddress.lan
ServerAlias www.someaddress.lan
DocumentRoot /var/www/wordpress
</VirtualHost>

<VirtualHost *:80>
ServerName someaddress.lan
ServerAlias someaddress.lan
DocumentRoot /var/www/html
</VirtualHost>

If you want to do without installing any kind of DNS server in your machine, then you can put an entry into /etc/hosts file.

 127.1.1.1    www.someaddress.lan    someaddress.lan

Actually ever host before resolving the domain name by contacting its DNS server, first checks its own /etc/hosts file. If it founds that domain entry in that file, it doesn't contact its DNS server.

EDIT: You have to add entries for each in /etc/apache2/sites-enabled/000-default

<VirtualHost *>
   ServerName    someaddress.lan
   DocumentRoot  /var/www/html
</VirtualHost>

<VirtualHost *>
   ServerName    www.someaddress.lan
   DocumentRoot  /var/www/wordpress
</VirtualHost>

NOTE: Don't forget to restart the apache2 server after changing the above configuration file by the following command:

$ sudo /etc/init.d/apache2 restart