Hello
Let me see if I can answer some of your questions here.
Pears is a good food to start with. Some more common foods to follow with are sweet potato, apple, banana, carrots, avocado (those are some of the ones we did first). You can try most single fruits or veg but probably want to stay away from berries, tomato, and corn as they tend to be common allergens and are best left until a year.
It is a good idea to introduce new foods in the morning so if there is a reaction you have the entire day to sort it out and tummy issues don't affect your nights. You can continue with the pears for one meal as long as you like or until you've introduced enough variety to mix it up a bit.
I don't think there are any rules when it comes to cereal. Some moms don't even do cereals. Since you are giving formula your LO is getting enough iron, so cereal isn't completely necessary. Give it at one meal, or more if you like.
You can probably give her more than 1/2 a jar if she likes is so long as it doesn't interfere with her formula intake. You don't want her to start drinking less formula. Liquids are the most important source of nutrition for your LO until a year. If she is still drinking the proper amount of formula and seems to want more solids, then I would say it's ok to let her have a bit more. She is still so young though so there is no need to rush it. Follow her lead, and like I said make sure liquids come first. Keep tabs on how much she is drinking, and if it starts to dip then back off on the solids a bit.
There are no rules for when your LO should be doing 3 meals a day. Again, follow her lead, and your own instincts. And again, keep up with the formula over solids, so don't go to 3 meals if she starts drinking less formula.
I would say traditionally you would offer the bottle before her solids since it is more important. The way to look at it is the bottle should be the E part of your EASY, and solids are part of the A. That way she is not filling up on solids first since you want her to keep up with her fomula intake. Try offering solids 30mins after the bottle instead.
4mos is a little early to be starting solids but it seems to be going well so far. Did you start on the advice of her doctor? Since she is so young I would take your time and introduce things slowly. Sounds like you are off to a good start, but there is no rush.
I would encourage you to read through the FAQs here as well for lots more helpful info:
http://babywhispererforums.com/index.php?board=94.0Hope I've been able to answer all your questions.