I thin that in 1706 it was a perfectly ordinary smallholding or croft, nothing unusual. There certainly would not have been, at that time, a special place where poor folk lived. Later, in the 19th century, there were poorhouses, but not at the start of the 18th century in rural parishes.
You can probably forget about records of servants. 1706 was long before the census, which is really about the only records you will find of most servants, unless they were in some big house and the wages records have survived - not that I've ever seen anything like that from the early 18th century, but something might exist for the big estates.
The fact that there was someone who was a pauper living there in 1841 is likely not connected with your people in 1706. Until 1845 the responsibility for looking after the poor was on the Kirk Session, and their minutes and accounts often contain detailed reports of the poor who had applied for relief, and of the amounts of money paid out to them or spent on providing for them.
The Galston Kirk Session records are in the National Records of Scotland, and the ones from 1706 have survived. Go to
https://catalogue.nrscotland.gov.uk/nrsonlinecatalogue/search.aspx and search for Galston, putting CH2/ in the 'reference' box, and you can see what is available. They have been digitised but are not yet available online. You have to go, or get someone to go on your behalf, to General Register House in Edinburgh or one of a few local archives that have a link to the NRS.
