Thanks @crimsonlake.
OP, I'd look at what people consider red flags, and make sure that when you meet someone, and you will, you know what your boundaries are.
OLD is not ideal.
Make sure you know what lovebombing is, what grooming is, and that you know what are signs of disrespect, cheating and abuse.
I'm not saying you don't know anything, but if you are looking for a man to make your life complete you will be quite vulnerable. The things I mentioned in my previous paragraph will often be very subtle, but if you know to look out for them, you will be more likely to protect yourself.
Grooming - if he is an abuser he'll be testing how much of a pushover you are.
Lovebombing - it will look like he is totally smitten with you, and things will be moving very quickly. It will be troo lurve for him, and this can be very attractive. When you're strolling in the sunshine hand-in-hand as love's young dream, you won't be thinking about it all going wrong.
Disrespect - could be a general attitude towards others such asd waiting staff, or using words like bitch or dog for a woman, to attitudes about stag night behaviour, or comments about you. Know where your limits are.
Red flags - all sorts but things like no access to his DC, his XP is a psycho, not meeting his friends and family, drug/alcohol abuse..., being controlling ,...
At the first sign of shit, dump him.
Make sure you and he are on the same page re having children fairly early on. 30 is young but not that young if you are hoping to have a family.
Oh, and keep your life full, make sure you have a social circle, and even if you meet Mr Right, there may be a day when you are alone again. You might be a little old granny by then but ykwim.
I'm sure there are some nice men out there but there are things I learnt the hard way.