I exclusively pumped for six months with my first baby. Out of misplaced mum guilt that breastfeeding wasn't working and breast is best, yada yada yada. To be honest I wouldn't recommend it to anyone, based on my experience. It really is double the work. In order to exclusively pump you really need to have a pumping session eight times every 24 hours. I nearly drove myself mad with exhaustion doing it. I wish I'd have either mix fed or just FF.
If you're going to do it then I'd buy a decent double electric pump (I had an Ardo Calypso) although I've heard good things about the Elvie. It's expensive though!
For cracked sore nipples Jelonet gauze and Lanisoh cream are fab.
Honestly, I'd either breastfeed, or if you can't mix feed with expressed and formula.
Second baby, I mix fed from the start. Expressed milk in the day and formula at night for 12 weeks then onto formula only. I was a lot happier and well rested second time around and there is zero difference in my children's health or development except baby number 2 had a happier, more chilled out mother!
Also not everyone can express well. I was lucky and could, with a double pump, get 12oz off in half an hour. I know lots of people who breastfeed fine but can only get 1-2oz off on a pump.
Hope it works out for you, those first few weeks are tough. Be kind to yourself!