I think most people give milk first and solids an hour (or so) later, this way they get their fill of milk as the most important food. The hour you wait just gives them a chance to get a little hungry so willing to try some solids which is really to learn about taste and texture rather than 'feed' them. Gradually towards the 12 month mark they will take more solids, if they are they will likely reduce their milk intake on their own (you don't want that to be too fast!) and then at 12 months the solids become the main food source and milk continues, but less of it.
The bf again after solids is because LO is thirsty and wants some liquid to help the food down.
I bottle fed but even so my LO wanted milk straight after a solid feed for the first couple of weeks.
When your LO is 6 months you should introduce a sippy cup and offer water at meal times in case LO like a drink whilst eating (not so easy to offer the breast when in the high chair and also good cup learning practice). I think it will depend how quickly your LO learns to drink from a sippy as to how long you will need to offer a bf after solids. If they don't have enough liquid/water/fore milk to quench thirst they may get a bit constipated...sometimes this is overlooked when solids are introduced as we are so used to giving the breast or bottle at 'set' times.
hth