I gave you this really long post and I lost it. here's the sum up.
My dd is BF and didn't take to rice cereal. BM is sweet and rice cereal is not, you could mix it with BM but on it's on with water, not too tasty
I would start with pear or avocado. both are easy on the tummy and have a good consistency. I would also try in the morning, helps for you to see if they are allergic. If she doesn't take to those, put a banana or avocado in a mesh feeder to get her used to the taste. we had to do that and it worked great.
It took us a while to transition and so we did bf one hour after solids for a while, seemed to get her a little hungry but not frustrated. We started at exactly 6 months. she wasn't too intrigued before that.
don't get frustrated in the beginning, they will get it. Once they do, you will want to through a party. it's pretty exciting.
I also used gripe water for tummy upset and that seemed to help.
this is short, but I don't want to type and lose it all again...let me know if you need more help
I have a friend who's dd had reflux and the rice cereal made little impact. She just had to outgrow it...sorry not good help.