Below is my code which works on a custom lead object.  The work I am doing is on a force.com org which does not have the standard lead object.  On the custom lead object I have a check box called convert.  When checked a trigger fires and using the data contained in the lead it creates a contact and an account.

Problem 1 - I want to link the account and contact but I can't get it to work, I guess it's because the account is not yet created

Problem 2 - Instead of checking the tick box I would instead like a detail page button when clicked it would fire the trigger below

trigger ConvertTrigger on fp_lead__c (after insert, after update) {
System.Debug('## >>> Trigger executing run by ' + UserInfo.getName());

    fp_lead__c[] myLeadsToProcess = new fp_lead__c[]{};
    for(Integer i=0 ; i<Trigger.new.size() ; i++) {
        if (  Trigger.new[i].convert__c == true ) {
           
            myLeadsToProcess.add(Trigger.new[i]);  // build list of recs to process
   
        }
    }
    if(myLeadsToProcess.size()>0){

        Contact[] myNewContact = new Contact[]{};
        Account[] myNewAccount = new Account[]{};

        for (fp_lead__c myLead : myLeadsToProcess) {
        
            Account act = new Account();
            act.name = myLead.company__c;
            act.website = myLead.website__c;
            myNewAccount.add(act);

            Contact con = new Contact();
            con.firstname = myLead.First_Name__c;
            con.lastname = myLead.Last_Name__c;            
            con.phone = myLead.Phone__c;
            con.mobilephone = myLead.Mobile__c;
            con.fax = myLead.Fax__c;
            con.email = myLead.Email__c;
            con.title = myLead.Title__c;
            con.salutation = myLead.Salutation__c;
            myNewContact.add(con); 
           
            }     
            insert myNewContact;
            insert myNewAccount;
        }
   
System.Debug('## >>> Trigger END <<<');
}