For the crawling one, everytime he picks up his paws to scratch move your hand a little farther away (but not so far that he gets up) and saw crawl at the same time.

For the standing "trick" what I did with Maggie was, have them stand, and put your arm under them (behind their belly, closer to their legs) but don't let them feel it. Tell them to stand, and stay. If they start to sit/ lay down, say no and at the same time put pressure underneath them to force them to stand.

These may not be the best tips, but this is what I did with my girls. Hope it helps!