I was going to say that the dribbling and chewing sounds far more like teething than a sign that she is ready to start weaning, ofonajolly. the night waking might be signs of a growth spurt - so maybe she needs more milk or the hungrier milk (if you are formula feeding).
Looking back to when mine were that age (and they are 16, 18 and 20 now, so it is a while ago), we were advised to wean at 4 months, so that is what I did. I started them on baby rice, and then went onto the fruit purees in jars - though ds1 hated all the sweet ones, and would only eat the savoury ones.
With ds1, I pretty soon started making my own purees - I would cook up veg and different proteins - using the jars as inspiriation - puree these all up and freeze them in ice cube trays - then I could give him a cube of (say) parsnip, one of white fish and potato, and one of peas. With ds2 and ds3, I didn't have the time or energy to do this, so I usually blitzed up a bit of whatever I was cooking for the others - you do have to make sure you are cooking with no salt or additives.
Equipment wise - you will need some baby bowls and spoons, bibs, and if you are going to make your own purees, a small hand-held or stick blender, because that will do small amounts most easily.
All that said, I think if I were doing this now, I would definitely wait until 6 months, and would then be looking at baby-led weaning, either alongside using purees, or instead of using them - from what I have read here, that seems to be reasonably stress-free.