So you are aiming for a combi FF and EBM. Got it.
There a many things to consider in your situation. So, please bear with me if this gets a bit long.
First -- there are LOADS of women that start off in your situation. The thought of putting a baby on their boob and letting them suck away just freaks them out. Personally, I think this is a result of our society over sexualizing a women's breasts. By the time most women have babies they have seen breasts as nothing but sexual objects there for the pleasure of men and to fill out a top so they can look sexy.
So, the thought of allowing a baby... YOUR baby... to use these sexual objects is a bit off putting to say the least.
Try to wrap your head around the idea that your breasts were NOT designed to be sexual objects. They are designed, first and foremost, to be utilities that feed a child. Have you ever seen "primitive" cultures that dress little? They usually cover their lower bits, but not women's boobs. Because those are there for a purpose other than a sexual one.
Anyway, most (not all, but the vast majority) get over those hang ups very early on. They latch that baby on and suddenly find it completely natural and not strange at all. Then you even have ladies like me... I've been BFing for nearly 19 months straight now, almost 6 months of BFing two at once... I have to remind myself my boobs can be sexual!
So, don't assume just because you find it weird now that you will always find it weird.
I think it would be in your best interest to suss out exactly what kind of goal you have. Otherwise you won't know if you are coming or going.
Do you only want to BFed the colostrum? Or for the first week? Or the first month? If you want to BFed at all, I would highly recommend not starting with FF until after you are done BFing. You will likely just make more problems for yourself than you want. Nipple confusion would be likely, too. It would most likely end up in giving up the BFing end of it before you intended, which might lead to guilt issues.
As for expressing, keep in mind expressing isn't as easy as it sounds.
Especially exclusively expressing. That is the HARDEST route to go. By far. It combines all the problems of FFing with BFing and piles on the difficulty.
I think if you are truly interested in giving any kind of BFing a go (which I HIGHLY suggest), you should commit yourself to trying it for at least a few days until your milk comes in. If you get into it and find it completely impossible, then you can express as much as you can as often as you can until you dry up or don't want to express anymore. Supplement with formula and switch to pure FF after you stop expressing.
As for not knowing how BFing works, it really is quite natural for most babies and moms. Not all, but most. There will be some pain in the early days while you adjust, and it may take a little work to figure out to get baby to latch really well, but they have an amazing instinct for it. My DS was better at judging his latch from the moment he was born than I was!
DD, on the other hand, was a bit lazier, but I never had to work too hard to get it sorted.
If you are interested, I can go into details about when you nurse the first time, how you do it, what a good latch is, etc etc. But that is another long post, so I won't go on about it here unless you want.
So, why should you consider giving BFing a go? Because I think you are more open to it than you think. You came on here afterall!! And it might not be as bad as you think it will be. You might even find that you like the special bond it creates. I always wanted to BFed my children because I knew it was best for their health and well being... I never had any clue it would come to mean so much to me, too. You can always stop BFing and start FFing if you find it isn't for you. However, once you move to FFing it is nearly impossible to go back to BFing. So, if you want to give it a go, you need to try BFing first.
Not to mention the health benefits. BFed babies tend to be healthier and smarter.
More than one study has shown that.
So, I can give specific advice about how to do just about anything you want... but I think you should decide on definite goals first. Then, let me know what those goals are and we will work from there!