Hi there
WRT naps and increasing A times, you would follow LOs signs that he is ready for the A increase and dropping the CN. It's a question more suited to the sleep boards but I will say if you are getting two 2hr naps plus a CN and a good night length then I wouldn't change a thing right now - it is ain't broke - if things start to go off track that the time to tweak your routine and move towards the CN drop.
Solids then. Here's some BW info
Introducing Solid Foods the Baby Whispering WayWeaning Guidelines from Secrets of the Baby WhispererAn example of where the milk and solid feeds fit into the day
Routines for Solids and Bottles/BF's 6-12monthsamounts of milk
Amount of Formula/Bottles/BFs when having Solids and lots of other info on solids here
FAQ's - Frequently Asked Questions & Related InformationIn general offer some tastes of solids about an hour after a milk feed, and where it fits with your routine. Let your LO guide you in how much solids he would like to taste and also how much milk he'd like in those bottles. All babies take a different amount of milk so really it's a case of offering and seeing if he drains the bottle, if he does then increase the amount so that there is roughly an oz or so left in the bottle at each feed, this way you know he is feeding to his fill.
Your routine (going on the times you've given for naps) will look something like
WU (not sure when your WU is looks like 7am?)
E 7.00 milk
E 8.00 solids
A 2hr
S 9 - 11
E 11.00 milk
E 12.00 solids if/when you choose to offer 2 meals
A 2hr
S 1 - 3
E 3.00 milk
E 4.00 solids if/when you choose to offer 3 meals
A
S CN 5-5.30
BT milk
There is no strict rule as to how many meals to offer initially, no need to offer 3 unless your LO is super interested in solids. Most people start with breakfast or lunch just so there is plenty of time through the day for LO to digest the food and for any reaction to show.
There is also info in the FAQs on BLW (baby led weaning) which is increasingly popular and the advised method of weaning in some areas, this skips the puree/mashed stage and goes directly onto finger foods. Often you can offer just a little of your own meal if you have cooked appropriately (ie without sugar, salt, honey) and LO shares the family meal from the start rather than having separate meals. You might want to read up on it if you think it sounds like something you'd be interested in.
You can get support and advice on either the BLW or the traditional weaning method here
I think that's everything. Do ask if you have more questions there are plenty of people here with lots of different experiences