With a prior V delivery under your belt an induction is far more likely to be successful even if you're not favourable. Try not to worry.
They'll usually do up to 3-4 sets of gel, 3-6 hours apart before giving up on it, and even if it hasn't put you into active labour it should have started to help your cervix thin and soften. The next option is the syntocinon drip which will contract your uterus, and hopefully efficiently, or AROM (break the water).
Personally if I was given the option I'd keep waters intact for as long as I could, preferably have them break naturally. Some reasons being; with them watching out for the meconium, if your waters are broken and it is present that could really put you under time pressure to deliver. Labouring with waters intact is said to relieve some of the pain and pressure, and also early rupture of membranes is linked to poor positioning of the baby. Not always, of course, sometimes AROM is a very good method of induction.
With regards to the meconium, it is relatively common, my DD had it when she was born also - very thick. I think about 1/3 of babies have passed it before birth? It doesn't always indicate distress, and there is some evidence to suggest that suctioning may be harmful, and even some to suggest that it can be aspirated before delivery. It can be very serious when a baby develops MAS and shouldn't be taken lightly, but it can be just one of those things without a specific cause.
DD had tons of mec and she was a home birth.