Good for you for not doing cereal!! I believe infant cereal to over processed and nutritionally void. They are refined so much so that they greatly effect their glycemic index, and over time can contribute type 2 diebetes, obesity, etc.
And to make matters worse, because everything has been taken out, any nutritional value must then be added back in. Otherwise known as "fortified", or "enriched". Infants also don't produce the digestive enzymes needed to break down grains until after their first year. Wheat and rice are now being added to the allergen list, which means you should wait until after the 1st year to introduce them.
We're also not doing jarred foods. The jury is still out on purees. They kind of gross me out, and I don't like the idea of force feeding her mush, but I let her self feed some mushed avocado the other day and she loved it! So, I might make some home made purees for her to "play" with. I also have a sweet potato in the oven as I type!!
Don't worry about getting Spencer used to eating solids, he'll do it when he's ready, there is no rush! You're also breastfeeding, which is MORE then enough nutrition for the first year, so you're good there. Have fun with solids, Ava was SO funny the other day with her avocado, it was such a riot! I can't wait to see how the sweet potato goes.