Whatever you do, do not try to invent a new way to type. The method that has been developed with your pointer fingers each beginning on the f and j keys is used by everyone who can type faster than 80 WPM because it is the most efficient means of typing. What you will have to do is learn to stretch your ring finger out to touch all of the keys that are normally hit by the pinky finger. If you haven' yet begun to touch type (typing without having to look at the keyboard) then begin typing and from now on ALWAYS type like this:
http://inttips.com/…Line up your fingers in the row that has the asdfghjkl; keys with your fingers along the sdfjkl; keys (as you won't be able to start off with a finger on the a key as you are missing your left pinky finger)
I looked at your profile and it seems that you have very little practice if any at all. This is going to be difficult, just do not try to tackle it all at once under any circumstances. Set time before bed or sometime during the day that you don't do anything EVERY day and practice a little bit during this time. It does not matter if you look while you type - BUT - YOU MUST DO YOUR BEST not to move your left hand over when hitting the qaz keys, you must learn to hit them with your left ring. You can move over your hand to hit these keys but when you do this, especially during this point in time while you are not familiar with the keyboard, you will have trouble keeping track of where your hand is when you begin to type without looking. The whole meaning on this position of your hand is so that you will be able to know where each key is in respect to where you fingers are at all times. In theory you will never move your hands, although you will most likely have to move them every once in a while to hit the backspace. Although you shouldn't ever have to to use the backspace it is something that will happen eventually. This time is crucial as you are beginning to train your mind as to what to do when you want to hit the letter a, and if you tell your brain to do the same thing every time you will learn relatively quickly, while if you didn't you might never have learned without lots and LOTS of practice. If you continue to have troubles buy a program for typing (there are countless and many aren't really all that expensive although lots are meant for little kids (it's no big deal if they are because these programs are the best way to learn)) and you should be set, as the practice will be put into small steps that you will learn to do.
If you do not buy a program then just follow this two rules and practice a little bit every day.
1. Under no circumstances are you to move your fingers from their home positions (left ring on s left middle on d left pointer on f ; right pointer on j, right middle on k, right ring on l and right pinky on semicolon / ;) unless you are moving let's say your middle finger up one to hit the i key. You will find that if you have assigned fingers to certain keys then you will learn much more quickly to type without looking (a skill that is extremely valuable when typing) and you will be able to type more quickly. You will have to learn to always use your left pinky to hit the shift key for when you need to capitalize a letter (coincidentally I only ever use my left pinky when hitting shift to capitalize a letter out of habit, so this shouldn't be something that will hinder your speed.)
I have tried typing without my left pinky, and although it is rather difficult it is perfectly doable and if anything the problem will be in your head. It will be like learning to do anything else without your left pinky. It will be difficult but certainly not impossible. I believe in you, and WHATEVER YOU DO DO NOT GIVE UP. I know that you will most likely think "hmph, well you know that this is a skill that isn't really necessary," but it will be very useful.
SUMMARY:
Regarding your question on finger position, exactly the same. Use your left ring for any keys that you would normally hit with your left pinky. Hit shift with your left pinky. DON'T GIVE UP. Enjoy it ( you will find yourself improving, and when you do relish in this achievement ), and understand that you will hit barriers in typing the same way you will hit barriers in any activity that you can improve in. It is like running, when you will hit a point in time that you will believe that you will never be able to go any longer. At one point in your life you may believe that your body is physically incapable of running a marathon, only to learn after more practice that you really can. Although it is important to know that just like a marathon your mind will tire from typing for too long so if you practice a lot and you find yourself slowing this is only normal. Also, never ever try to go too fast, only try to type perfectly and get 100% accuracy.
I hope I was of some help. This forum sort of sucks so a lot of people here will try to help you and make no sense. Maybe I made no sense, but don't be discouraged by all of us dummy heads. Have a great day.