How do you choose soldering iron tip size and solder wire diameter?

Question

Hello Friends and E/E Engineers, 
 I have bought this solder bread box for my new project. This is my first time to solder my own circuit. 
 I think it is the universal standard 0.1" pitch holes board. 
 According to your precious experiences, what soldering iron tip size and soldering wire diameter do you choose? Primarily, I do pass-though-hole parts plus few SMD.

I did try a soldering iron tip in 1mm diameter and solder wire in 0.8mm diameter on this board but my solder joints seem too fat , not as slim as theirs shown here: 
 https://www.adafruit.com/product/5900

phoenixcomm · Answer

HKPhysicist Ok FORGET EVERYTHING YOU KNOW, THINK YOU KNOW. 
 Go to my Soldering School blogs and READ ALL POSTS! 
 Then Download from the web NASA-STD-8739.3, NASA Training - Student Workbook for Hand Soldering, NASA Training - Photos: 
 these and more can be download from my Server http://www.nexgen-simulations.com/Library/TM.index.html Find NASA and click on the links near line 60, There maybe others to interest to you as well. 
 My go to solder is a Kester Sn63 flux core solder but I use smaller solders 0.031", or 0.025" why? smaller solder is easier to use, and less is better, globbing not allowed.

How do you choose soldering iron tip size and solder wire diameter?

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