A good book & lots of reading beforehand, so you know what to expect and common problems/solutions.
Expect growth spurts at around 10 days, 6 weeks and so on - be prepared for baby to want to feed almost constantly through them, and know they will pass.
Sorry to hear about your partner - my DH really helped because he did everything else so I could concentrate on getting feeding established. But could a friend ir your mum support you? If so, ask them to attend a BF class or read a book about BF, as my own mum didn't BF and couldn't understand how often a newborn must feed to establish supply, so wasn't supportive and was desperate for DD to be FF.
Finally, I did buy one box of ready made formula bottles, personally I knew I'd feel better knowing they were in the cupboard than having to send someone to Tesco at 3am. I have DD one on about night 3, at 3am, one a few days later and one in the car at about 6 weeks. They were handy to have in and didn't affect my supply.
BF in the early days is hard. I made the decision to never give up on a bad day. People cite 6 weeks as being a 'turning point', for me this was more like at 8-10 weeks. But it did come.
I also wanted to try it, but didn't put too much pressure on myself incase it didn't work out for me - try your best, so if it works, great and if not, know you tried and that babies aldo thrive on FF. 