Hello Ishan.

I've done a similar thing in the past, I'm not sure this is what you looking for but here it goes.

 public PageReference sendPdf(String Email) {
    
    Blob body;
    PageReference pdf = Page.VisualforcePDF; // the name of your Visual Force page
    //In case you need to add Parameters to your page
	pdf.getParameters().put('id',accountId);
	
    try { 
      // returns the output of the page as a PDF
      body = pdf.getContent();
 
    // need to pass unit test
    } catch (VisualforceException e) {
      body = Blob.valueOf('Some Text');Spell Check
    }
 
    Messaging.EmailFileAttachment attach = new Messaging.EmailFileAttachment();
    attach.setContentType('application/pdf');
    attach.setFileName('PDFName'.pdf');
    attach.setInline(false);
    attach.Body = body;
    
    Messaging.SingleEmailMessage mail = new Messaging.SingleEmailMessage();
    
    mail.setToAddresses(Email);
    mail.setFileAttachments(new Messaging.EmailFileAttachment[] { attach }); 
    mail.setSaveAsActivity(true); // to save as an activity or you can set this to false and create a task by yourself
    
    // Send the email
    Messaging.sendEmail(new Messaging.SingleEmailMessage[] { mail });
    
    return null;
}

If you decide to create the task yourself, just she the description to:

Description = mail.getPlainTextBody();

Hope it helped.